Good luck with the build Chris. Dave is an amazing builder and is fun and informative when he posts his build,s. Get a exacto knife with a set of various blades it helps when you get down to the finest details and allows the tiniest bits of wood to be removed.Turns out it was the face of the plug bearing heavily into the rifling inside the barrel - enough so that the threads were damaged. Chases the threads in the barrel and on the tang - then carefully polished the plug face with 1000 grit and wd-40 - essentially just polishing the plug face. Now I can install and remove the breech plug (with some effort on the last 1/4 turn - but it does go on and off and is tight.
Chris
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