Gunner Asch wrote:
On Fri, 27 Nov 2009 08:11:42 -0600, "Pete C."
wrote:

Gunner Asch wrote:
On Thu, 26 Nov 2009 19:56:17 -0600, "Pete C."
wrote:

Gunner Asch wrote:
On Thu, 26 Nov 2009 14:43:19 -0600, "Pete C."
wrote:

I have a BOSS with the micrometer locknut stuck at the bottomed out zero
position. So far Kroil has not released it, nor has considerable torque
applied from channel locks via some 1/8" hard rubber to protect the
knurl.

Suggestions?
I cant remember if they are right or left handed threads. Have you tried
both ways?
They are normal right hand type threads. The front brake / weight
section unscrews ok, just the back locknut is... er... locked at the
zero position. The instructions say to bottom it when setting the
calibration of the number ring, so it's certainly intended to be
bottomed out and not seize.

Firing lead bullets through it?
Er, not in my office. I have applied plenty of Kroil, as well as some
mild heat with a hair dryer.
We are talking about a BOSS barrel tuning device on the end of a rifle
barrel, right?
Yes, on a BAR Safari Mk2. It is metal, and rapidly becoming a
metalworking project to fix it. May end up wrecking the locknut to get
it off and having to buy a replacement.

Ok. First thing you do is go to the Autozone and pick up a can of
PBlaster and hose it all down really well and let it set (barrel down)
over a rag or in a coffee can for a day or so.

It's soaked with Kroil overnight.


Then take a heat gun and slap some heat to it. Hair dryer will not get
hot enough.

I used the hair dryer because I didn't want to get it too hot. I can try
again with a heat gun and watch it with an IR thermometer.


Then try it while its nice and hot. And be sure you turn it in the
right direction. A little back and forth may help.

It's definitely a normal right hand type thread. There is just one
threaded section and the front brake / weight portion unscrewed just fine.


If it comes loose, remove it after recording your settings, make a
line/scratch or something..

It has the micrometer markings so you can record your settings. Indeed
the instructions have you bottom out the locknut and adjust the number
ring on the locknut to calibrate it, and that is where it is stuck,
bottomed out. There are no settings to record as this is a brand new gun
and next week will be my first opportunity to get out and sight it in.

then clean it up, and slopper some decent
high temp grease on the threads and screw it back together. Antiseize
compound is good too. The silver stuff at the Zone works well for this.

I've got anti-sieze for when I get it apart, but I shouldn't need it on
a brand new gun that's just sat in the safe for a few months.


Been shooting corrosive primers by any chance? Wolf?

Nope, not a damned thing through this BAR yet.


I cannot recall if its right or left hand thread. Check it out with a
magnifying glass if you can or read your manual..it might say.

Yep, normal right hand threads. The brake / weight section unscrewed
just fine in the expected direction.


http://media.browning.com/pdf/om/boss_02380_om_s.pdf


That may help. One assumes that you got the part with the holes.. off?

Yep, no issues there, just the locknut stuck.