You're welcome Daryl!
This is likely my last post on this gun for a week or two, I will be attending the CLA show and have some other obligations.
After reading one of westbj2's posts I took a closer look at the nipple seating. The nipple is platinum lined and the bottom is rounded with a gentle radius. The nipple seat in the patent breech was flat on the bottom and the nipple shoulder was standing proud when the nipple was bottomed out.
Since the snail was already threaded I needed a special tool that wouldn't bugger the threads while cutting a radiused bottom to the nipple seat. So I took a broken drill shank that would slip into the hole, filed it to the profile of the convex nipple bottom, then filed some fine shallow cutting teeth on the improvised tool:
First two teeth filed in:
All teeth cut:
The cutter was then hardened and drawn back to a straw color. I lubricated the end, chucked it in a hand drill and carefully went to work on the nipple seat, removing chips fairly often. The chips were fine like dust and made a slurry in the cutting oil.
The fine teeth left a polished surface on the nipple seat. I ran a bottoming tap down the hole, painted the nipple end with a blue Sharpie and replaced the nipple. In this photo I still had a couple of thousandths to go before the shoulder was seated. The blue marker on the nipple indicated a good seat. I will have to take another photograph of the completely seated nipple.
I decided it was time to fit the trigger guard to the stock, but first I needed to install the screw at the rear of the trigger plate.
I had to do some bending of the guard to match the stock profile, then held it in place to scribe around the finial. Wood was removed, inlet black painted on the guard, and the fit then cut process was repeated until the finial was all the way in.
I got it center punched for the screw hole and had to quit for the day.
That's all for now!
Curtis