Decided to see what could be done with an old flat face breech plug that came out with the early Triumph.
First I purchased a Savage vent liner and measured it out it appeared to be a 10-32 thread.
I set up the breach plug on the milling table of my drill press and bored the 1/8 hole the center line to match up with the 1/8 inch hole under the primer pocket. First Pic.
Second I reamed the hole with a number 17 drill.
Third I checked the vent liner with a 10 32 thread cutter and a thread gage to be sure that's what was needed.
I got out the 10-32 tap and mounted it in the drill press chuck so it was exactly strait and in exact alignment with the hole, then I turned it by hand while I put light pressure on the tap with the drill press.
Forth I hunted through my tools and found a cutter that matched the bevel on the back of the vent liner and cut the bevel into the breach plug.
Fifth I put a bit of grease on the threads and got out a T20 screw driver head and screwed the vent liner in.
This all took about 35 minutes about next Monday if its not raining I will take it out to the range and report on how well it works. Lee
Nobody has a comment???