Those old plugs look pretty rough.
What was done in the "good old days" isn't always what we want to practice today. The Gunsmiths Manual, first published in 1883 by
Stelle and Harrison have a section on breech plugs. They don't address this particular practice, but they do address some of the approaches to cutting breech threads that were sometimes used in their day (including breeches tapped with a “blacksmith’s tapered tap” and plugged with an accompanying tapered plug, as well as breeches made with a crooked thread), and they criticize them strongly (2013 edition. p 166- 169). I take from their statement that not all practices from the old days were considered wise or good craftsmanship even back in those good old days.
Of the 32 original plugs I have 2 are not notched, it was commonly done this way even. There’s nothing unsafe about it. We tend to think we’re smarter today, they did what they had to do and it worked just fine.
Yes, it's the case that plugs were commonly notched. I'm not disagreeing with that, so thanks for the clarification there. I hadn't meant to imply that notching was uncommon. And I hadn't meant to imply that a contemporary firearm with a lightly notched plug is out of bounds, either.
Yeah, every generation tends to think it is smarter and wiser than the generation before. But there are a whole lot of things that we don't do anymore that they did in the 18th and early 19th century. So there is general agreement that some of the extremes are best avoided, even though we may see them in antique examples.
I'm just making a general statement. I'm not interested in debating about breech plugs.
I have some research from the Sprginfield Armory on notching the plugs, I honestly believe they did it because of bits breaking, its documented here in the picture.
Pedersoli’s machined plug doesn’t need to be notched, however the fowling will accumulate against the face, that’s why i suggested conning the inside of the touch hole, this can be accomplished with a tiny burr.
The Navy Arms plugs were notched because they were longer same with Euroarms and early pedersoli’s.
You did exactly what i did to mine, i greased the threads for easy removal, there are many that debate the topic of breech plug removal was being unsafe, however I’m of the belief that its not unsafe at all.
I’m constructing a 1763 from custom parts, i had a barrel made from an example of 5 originals, will be posting a build along about it eventually in the future.
Have a great one !
Nick Genda

