I have several pairs of rimless reading glasses similar to these:

http://tinyurl.com/ybbjy4z

There are 4 tiny bolts that hold the metal parts to the plastic
lenses. Invariably, one of the nuts works loose. I have been using
needlenose pliers to tighten the nuts, but they work loose.

Some time ago, someone here recommended Loctite 290 (green). I got a
bottle the other day, but am unsure how to use it.

The dispenser tip comes sealed, so I used a needle to poke a tiny hole
in the tip, but it still comes out in a large droplet that I am afraid
will completely drown the tiny bolt and damage the plastic.

I tried dispensing the Loctite with the bottle upright, but was unable
to get a tiny droplet to stay on the tip long enough to tough the nut.

Next, I put a couple of drops on a lid and used a toothpick to
transfer a tiny amount to the nut. I was able to get the top of the
nut to turn green, but I'm not sure I got enough on it to actually
penetrate.

Does anyone have any other suggestions? Is a toothpick the right tool?
What about a Q-tip?

This has turned out to be more trouble than the glasses are worth. I
should just toss them and buy a new pair, but now I'm reluctant to let
the glasses win this battle of wills. :-)

On Mon, 25 Jan 2010 23:19:46 -0800, Prof Wonmug wrote:

I have several pairs of rimless reading glasses similar to these:

http://tinyurl.com/ybbjy4z

There are 4 tiny bolts that hold the metal parts to the plastic
lenses. Invariably, one of the nuts works loose. I have been using
needlenose pliers to tighten the nuts, but they work loose.

Some time ago, someone here recommended Loctite 290 (green). I got a
bottle the other day, but am unsure how to use it.

The dispenser tip comes sealed, so I used a needle to poke a tiny hole
in the tip, but it still comes out in a large droplet that I am afraid
will completely drown the tiny bolt and damage the plastic.

I tried dispensing the Loctite with the bottle upright, but was unable
to get a tiny droplet to stay on the tip long enough to tough the nut.

Next, I put a couple of drops on a lid and used a toothpick to
transfer a tiny amount to the nut. I was able to get the top of the
nut to turn green, but I'm not sure I got enough on it to actually
penetrate.

Does anyone have any other suggestions? Is a toothpick the right tool?
What about a Q-tip?

This has turned out to be more trouble than the glasses are worth. I
should just toss them and buy a new pair, but now I'm reluctant to let
the glasses win this battle of wills. :-)

Loctite 290 is a wicking thread locker. Just use your toothpick
and let the drop set on the already tightened nut for a couple
of minutes. Then wipe off the excess.

"Prof Wonmug" wrote in message
...
I have several pairs of rimless reading glasses similar to these:

http://tinyurl.com/ybbjy4z

There are 4 tiny bolts that hold the metal parts to the plastic
lenses. Invariably, one of the nuts works loose. I have been using
needlenose pliers to tighten the nuts, but they work loose.

Some time ago, someone here recommended Loctite 290 (green). I got a
bottle the other day, but am unsure how to use it.

The dispenser tip comes sealed, so I used a needle to poke a tiny hole
in the tip, but it still comes out in a large droplet that I am afraid
will completely drown the tiny bolt and damage the plastic.

I tried dispensing the Loctite with the bottle upright, but was unable
to get a tiny droplet to stay on the tip long enough to tough the nut.

Next, I put a couple of drops on a lid and used a toothpick to
transfer a tiny amount to the nut. I was able to get the top of the
nut to turn green, but I'm not sure I got enough on it to actually
penetrate.

Does anyone have any other suggestions? Is a toothpick the right tool?
What about a Q-tip?

This has turned out to be more trouble than the glasses are worth. I
should just toss them and buy a new pair, but now I'm reluctant to let
the glasses win this battle of wills. :-)



I just use clear finger nail polish. If needed it can still be undone if
lense needs replacement. WW

On Jan 25, 11:19*pm, Prof Wonmug wrote:
I have several pairs of rimless reading glasses similar to these:

http://tinyurl.com/ybbjy4z

There are 4 tiny bolts that hold the metal parts to the plastic
lenses. Invariably, one of the nuts works loose. I have been using
needlenose pliers to tighten the nuts, but they work loose.

Some time ago, someone here recommended Loctite 290 (green). I got a
bottle the other day, but am unsure how to use it.

The dispenser tip comes sealed, so I used a needle to poke a tiny hole
in the tip, but it still comes out in a large droplet that I am afraid
will completely drown the tiny bolt and damage the plastic.

I tried dispensing the Loctite with the bottle upright, but was unable
to get a tiny droplet to stay on the tip long enough to tough the nut.

Next, I put a couple of drops on a lid and used a toothpick to
transfer a tiny amount to the nut. I was able to get the top of the
nut to turn green, but I'm not sure I got enough on it to actually
penetrate.

Does anyone have any other suggestions? Is a toothpick the right tool?
What about a Q-tip?

This has turned out to be more trouble than the glasses are worth. I
should just toss them and buy a new pair, but now I'm reluctant to let
the glasses win this battle of wills. :-)

PW-

Locitie is unlike many adhesives. You dont have to worry about it
"drying out". Cut a reasonable amount off the tip (the part under the
cap).

Loctite is an anaerobic adhesive, it dries in the absence of air so no
worries about have a "big hole" in the tip. A tiny hole can often
wind up clogged with cured Loctite, as can the cap threads.

As others have mentioned you can apply it with a tooth pick, a Q-tip
will waste a lot of the stuff and it's not the best method in this
case.

This first "go 'round" might not work. If the threads were not very
clean (skin oil) can prevent proper curing of the Loctite and it they
work loose again.
Clean the parts with a bit of acetone, let them dry and try again.
Clean metal parts will lock up just fine.

good luck

cheers
Bob

On Tue, 26 Jan 2010 07:38:05 -0800 (PST), DD_BobK
wrote:

On Jan 25, 11:19*pm, Prof Wonmug wrote:
I have several pairs of rimless reading glasses similar to these:

http://tinyurl.com/ybbjy4z

There are 4 tiny bolts that hold the metal parts to the plastic
lenses. Invariably, one of the nuts works loose. I have been using
needlenose pliers to tighten the nuts, but they work loose.

Some time ago, someone here recommended Loctite 290 (green). I got a
bottle the other day, but am unsure how to use it.

The dispenser tip comes sealed, so I used a needle to poke a tiny hole
in the tip, but it still comes out in a large droplet that I am afraid
will completely drown the tiny bolt and damage the plastic.

I tried dispensing the Loctite with the bottle upright, but was unable
to get a tiny droplet to stay on the tip long enough to tough the nut.

Next, I put a couple of drops on a lid and used a toothpick to
transfer a tiny amount to the nut. I was able to get the top of the
nut to turn green, but I'm not sure I got enough on it to actually
penetrate.

Does anyone have any other suggestions? Is a toothpick the right tool?
What about a Q-tip?

This has turned out to be more trouble than the glasses are worth. I
should just toss them and buy a new pair, but now I'm reluctant to let
the glasses win this battle of wills. :-)

PW-

Locitie is unlike many adhesives. You dont have to worry about it
"drying out". Cut a reasonable amount off the tip (the part under the
cap).

Loctite is an anaerobic adhesive, it dries in the absence of air so no
worries about have a "big hole" in the tip. A tiny hole can often
wind up clogged with cured Loctite, as can the cap threads.

As others have mentioned you can apply it with a tooth pick, a Q-tip
will waste a lot of the stuff and it's not the best method in this
case.

This first "go 'round" might not work. If the threads were not very
clean (skin oil) can prevent proper curing of the Loctite and it they
work loose again.
Clean the parts with a bit of acetone, let them dry and try again.
Clean metal parts will lock up just fine.

I put some Loctite on one pair last night, then left it overnight to
dry. This morning, the glasses had broken right next to one of the
little bolts. I guess I used too much Loctite and it seeped down to
the lenses and weakened the plastic.

I've tried again with a second pair using less Loctite.

On Jan 26, 2:19*am, Prof Wonmug wrote:
I have several pairs of rimless reading glasses similar to these:

http://tinyurl.com/ybbjy4z

There are 4 tiny bolts that hold the metal parts to the plastic
lenses. Invariably, one of the nuts works loose. I have been using
needlenose pliers to tighten the nuts, but they work loose.

Some time ago, someone here recommended Loctite 290 (green). I got a
bottle the other day, but am unsure how to use it.

The dispenser tip comes sealed, so I used a needle to poke a tiny hole
in the tip, but it still comes out in a large droplet that I am afraid
will completely drown the tiny bolt and damage the plastic.

I tried dispensing the Loctite with the bottle upright, but was unable
to get a tiny droplet to stay on the tip long enough to tough the nut.

Next, I put a couple of drops on a lid and used a toothpick to
transfer a tiny amount to the nut. I was able to get the top of the
nut to turn green, but I'm not sure I got enough on it to actually
penetrate.

Does anyone have any other suggestions? Is a toothpick the right tool?
What about a Q-tip?

This has turned out to be more trouble than the glasses are worth. I
should just toss them and buy a new pair, but now I'm reluctant to let
the glasses win this battle of wills. :-)

Another technique you might try is to use a hyperdermic syringe (The
one doctors use to give injections). This will give you accurate
control of the Locktite. They are not easily gotten hold of due to
the war on drugs. If you can convince your doctor or pharmacist that
your need is legitimate you may be able to get one. We used them in
the past to solvent join plexiglass(acryic) pieces together with
ethylene dichloride and capillary action.
Joe G

On Tue, 26 Jan 2010 09:35:30 -0800, Prof Wonmug wrote:

I put some Loctite on one pair last night, then left it overnight to
dry. This morning, the glasses had broken right next to one of the
little bolts. I guess I used too much Loctite and it seeped down to
the lenses and weakened the plastic.

I've tried again with a second pair using less Loctite.

I watch the Sunday paper ads. Then I pick up reading glasses at a 2
for 1 price.

I break them all the time, even found one pair in the lawn I lost.

No need for fancy Loctite, nail polish, toothpicks (all good ideas,
btw) or even Super glue on the offending nut.

I generally stick to either blue Loctite, or super glue. I put it on
the female threads, then screw in the male part. Loctite for stuff I
want to get apart, super glue for more permanent fixes. You want it
CLEAN. Rubbing alcohol works fine, and won't bother the plastic.

On Jan 26, 9:35*am, Prof Wonmug wrote:
On Tue, 26 Jan 2010 07:38:05 -0800 (PST), DD_BobK
wrote:



On Jan 25, 11:19 pm, Prof Wonmug wrote:
I have several pairs of rimless reading glasses similar to these:

http://tinyurl.com/ybbjy4z

There are 4 tiny bolts that hold the metal parts to the plastic
lenses. Invariably, one of the nuts works loose. I have been using
needlenose pliers to tighten the nuts, but they work loose.

Some time ago, someone here recommended Loctite 290 (green). I got a
bottle the other day, but am unsure how to use it.

The dispenser tip comes sealed, so I used a needle to poke a tiny hole
in the tip, but it still comes out in a large droplet that I am afraid
will completely drown the tiny bolt and damage the plastic.

I tried dispensing the Loctite with the bottle upright, but was unable
to get a tiny droplet to stay on the tip long enough to tough the nut.

Next, I put a couple of drops on a lid and used a toothpick to
transfer a tiny amount to the nut. I was able to get the top of the
nut to turn green, but I'm not sure I got enough on it to actually
penetrate.

Does anyone have any other suggestions? Is a toothpick the right tool?
What about a Q-tip?

This has turned out to be more trouble than the glasses are worth. I
should just toss them and buy a new pair, but now I'm reluctant to let
the glasses win this battle of wills. :-)

PW-

Locitie is unlike many adhesives. * You dont have to worry about it
"drying out". *Cut a reasonable amount off the tip (the part under the
cap).

Loctite is an anaerobic adhesive, it dries in the absence of air so no
worries about have a "big hole" in the tip. *A tiny hole can often
wind up clogged with cured Loctite, as can the cap threads.

As others have mentioned you can apply it with a tooth pick, a Q-tip
will waste a lot of the stuff and it's not the best method in this
case.

This first "go 'round" might not work. *If the threads were not very
clean (skin oil) can prevent proper curing of the Loctite and it they
work loose again.
Clean the parts with a bit of acetone, let them dry and try again.
Clean metal parts will lock up just fine.

I put some Loctite on one pair last night, then left it overnight to
dry. This morning, the glasses had broken right next to one of the
little bolts. I guess I used too much Loctite and it seeped down to
the lenses and weakened the plastic.

I've tried again with a second pair using less Loctite.

I learned the hard way that Loctite attacks some plastics.

I Loctited up about 100 assemblies with a plastic thread.....softened
the plastic so threads failed.

cheers
Bob

On Jan 26, 7:31*am, "WW" wrote:
I just use clear finger nail polish. If needed it can still be undone if
lense needs replacement. *WW

I've been using clear finger nail polish for many years on
applications like this, including gun sights. It's great at holding
fasteners stationary and breaks cleanly when necessary. It cleans up
nicely with acetone.