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Discussion Starter · #1 ·
Hello everyone,

This is my first post although I have followed this forum for quite a while.

I own gen 2 sub2000 and recently I purchased Mcarbo triger, springs and guard. Unfortunately, I was not able to install it because I have difficulties removing the castle nut which holds the bolt tube.

I tried the method suggested in Mcarbo videos (punch and hammer), but no matter how hard I bang, the nut will not loosen.

I purchased strap wrench, but it slips.

Any ideas what to try next? I understand that Keltec uses some sort of adhesive on this nut (epoxy?), so I maybe heating it with a heat gun would help? I am worried, however, that this could soften the plastic and damage the gun.

I would appreciate any pointers.
 

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I wish I had a suggestion for you. Usually people are complaining about them coming loose without any effort! If I recall correctly - I don't own a Gen 2 - that is an actual castle nut with 4 notches in it isn't it? Maybe try going to a hardware store and get a castle nut wrench? Or just see if a local gunsmith can loosen it for you for a small fee?
 

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... the nut will not loosen. I purchased strap wrench, but it slips. Any ideas what to try next? ...I would appreciate any pointers.
I had a similar problem the first time removing the collar on my Gen 2. I very lightly warmed it up with a propane torch. Let it cool slightly and the strap wrench I had worked. Please be very careful using this method and cover the surrounding area with water-soaked rags.
 

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Discussion Starter · #4 ·
Thanks - propane torch sounds like a promising idea, if I bring myself to do it. :)

And what did you do when assembling it back, have you used any adhesive or thread lock on the nut?
 

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I don't have a Sub2000 myself yet, but maybe try spraying a bit of PB Blaster or similar as near to the threads and let that work in, wiping off the excess around it.
 

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Discussion Starter · #8 ·
I finally succeeded in upgrading my trigger. I was a bit reluctant to use the torch, so I decided to use something less drastic at first, namely my wife's hair dryer (set on high). I also I fabricated a primitive "castle wrench" using bearing puller and a piece of 1/2 inch copper pipe (for handle).

After securing the gun to the edge of a sturdy table, using C-clamps and some foam for protection, I heated the the nut with the hair dryer. I was then able to loosen the castle nut with my improvised wrench.

I used blue loctite for reassembly, as advised. So far everything works well, I already tested the gun at the range.

Thanks to all who replied.
 
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