"Blah" wrote in message
...
Dave M wrote:
"Blah" wrote in message
...
john royce wrote:
I have one of those small LED pocket torches (flashlight). To turn it
on
and off, I have to screw the end up towards the bulb end to compress
the
contacts against the battery.

The thread in the screw end is an extremely 'loose' fit and tends to
'unscrew or scew up' when it sits in the car glove compartment for a
while.

Is there a way to *stiffen* this 'loosness' in the thread, without
reducing
the electrical conductivity?

It needs to make good electrical contact for the torch to work, so I
guess
that rules out putting a dab of wood glue on the thread? Thanks
for any
advice.

run a rough file over the threads

Wrap a few turns of Teflon pipe thread tape around the male threads so
that the looseness is removed. You might have to rewrap frequently,
depending on how much use the flashlight gets.
Another suggestion is to cut a gasket out of a sheet of very thin rubber
or vinyl sheet, lube it with silicone grease and wrap the gasket around
the threads.

won't that insulate it? ...

Actually, no. The contact between the lens housing and the body of the unit
is actually made by the end of the body and a mating surface on the lens
housing. If the Teflon tape is confined to the threads, the contact should
be good. Also, the Teflon tape is extremely thin and is easily torn by the
threads; providing more contact surface.
The idea I was trying to suggest is to fill the gaps in the threads,
reducing the tendency for it to unscrew itself.
--
Dave M
masondg44 at comcast dot net

One good thing about Alzheimer's; you get to meet new people every day.