4575wcf
40 Cal
Butch's Gun Parts has a 3rd Model Brown Bess Hammer, Top Jaw, and Screw with a blank tumbler hole, and a frizzen that could probably be fitted to your lock. It looks close, but the frizzen is pictured in such a way as to be no help. Prices are right, I've never ordered from Butch though. Hope you bought the gun, it'll be a regular adventure and you can get support here on the forum for virtually anything you want to do. The frizzen comes unhardened (won't spark) til its heat treated.