Stripped set screw!

[Jessesky]

Hi guys,

I’m working on this old Damascus J.L. Dotter exposed hammer shotgun. The left firing pin is somewhat seized and clearly needs a new spring. The issue is the screw to remove the firing pin is stripped, and it’s bad! I’m not sure how to attack this? Photos are as close as I can get the camera to focus.

 

[edwardware]

My usual approach is repeated Kroil and heat (till the Kroil fizzes in the threads) to drive the Kroil in. Then a sharp prick punch (or a scribe) to rotate the screw out; if it was bigger, I would cut a common screw slot, but I don't think you have room.

If that doesn't work, then it's time to drill; that really wants a mill. If that receiver is valuable, you might just call Turnbull.

 

[rdnktrkr]

I like the kroil idea you can also try transmission fluid and acetone 50.50
Years ago I purchased some backwards drill bits from McMaster Carr and used them a lot in similar circumstances but I was working on boats then not firearms, most times the screw would release without having to use an ez-out.

 

[troy fairweather]

before i go to easy outs i have some broken small files, use them to tap and rotate the screws out. of course a good soak helps. atf and mineral spirits work real good

 

[skeeterfogger]

Working on aircraft turbos we had seized bolts all the time. No amount of penetrating oil would touch them. We made a drill block that fit over the head to hit center. Then we step drilled to near thread edge. Finished it with a reamer that took the hole right to the thread edge. Then we would pick the metal out and most of the time we could pull all the bolt thread out in one wire like piece.
This is for sure smaller but the process works.
Shlould you drill use L/H bit for sure and use good pressure and very low speed. It just may back out. And even if it doesn't back all they way out at least it loosened up.