This is my new Hy Hunter trial fitted with a brass trigger guard:
The Hy Hunter mainspring screw would not fit the trigger guard, so ordered a Uberti replacement part. The Uberti screw almost
fit. I went to my local hardware store and we tried various size nuts until one ran up on the screw, and found the thread was 10-24NC. So I bought a 10-24NC tap and chased the threads in the trigger guard. Also a brass Uberti backstrap had arrived and I have assembled the whole assembly. Needs some fitting and match polishing, but everything fits and the action works. Also need to make a pair of grips. Thinking of making a one piece style of grip. Will post more photos soon.