replacing an antique drum with worn threads?

[Taylorz1]

Thanks Rich wish I could claim credit but I learned it from a friend of mine who is a true master gun restorer. Just have to be careful with the interrupted cut as you cross the hole for the drum. Not a place to be using a paper thin shard of carbide at high speeds. Good cut and well supported tool form and it usually goes ok for me.

[Roger B]

I blew a drum out of a 1" .40 caliber barrel several years ago & it might have really injured someone had I not been on the range alone that day. I suspect a double charge with a drum that had not been well supported by the lock bolster for many years.  The drum & nipple were found about 50yds away on the other end of the range by a club member sometime later. As it was, I only suffered powder burns/freckles on my left hand, but it could have been much worse.  I hate to think about what might have happened if someone else had been shooting off-hand & had taken the drum & nipple to the head or face. I did not build the rifle I was shooting at the time, but if I can't use a patent breech on a percussion build, I make darned sure the drum rests on the lock bolster. And I'm not overly happy with that arrangement.
Roger B.