Well what I do in a case like this is I remove the lock and send it to Brad Emig at Cabin Creek Muzzleloading and get back a lock that functions. I don't even try anymore as I just don't have the expertise to fix them or harden the frizzen. Trial and error can get expensive. Good luck. cabincreek.net/
Dave
Give them a call or send an email in advance to get an idea of the coast and set up sending it in for a rebuild.