As much as I hate to say it, sometimes the best fix for a cheap flinter is to convert it to percussion. I just did an old Dixie York rifle that had a flintlock that would never be any good. I did a dirty frontier style conversion with a drum and nipple, and converted flint hammer. I plugged the extra holes with copper wire. It shoots good, and if you like frontier conversions, and repairs, it looks good. This gun can be photographed in a camp venue, and not attract any undue attention.
Hungry Horse