Those are rare who understand the full geometry of a flintlock. To supposedly match the balance of the mainspring to the frizzen spring. However, One can look inside the lock plate and detect where the s moving parts are rubbing on it, then remove material (from spring, tumbler, sear)until there is no friction there, and darn little elsewhere. I polish the mainspring where it contacts the tumbler, the tumbler where it contacts the mainspring, tumbler axels, hole in the plate. don't know how much that helps, but that's about all I can do. Don :winking: