[horsa]

Hey Lance,

I had an original 1942 dated 3" mortar firing stud. Problem is you need launching cartridges which have the caps with individual firing pins build into them. When the round is dropped down the tube, the stud is the stop against the center of the cartridge and it compessed the build in firing pin into the primer. I took the specs from the orignial and made actual firing pins which will work without the WWII style cartridges. That way you can use modern plastic 12-gauge shotgun shell hulls and load them with black powder or modern substitute.

I'll try and get photos posted in the next day or two of the 3" and 4.2" versions I made for my tubes along with an example of the WWII style cartridges with a firing stud for reference.