I picked up an orphan Dixie Tennessee lock at a gun show maybe 20 years ago. The lock looked like it wasn't that well fit to begin with, and then was used til it wore out. It did make a nice little lock after some work. As I recall, the screw holes were welded up, plate polished, new works (tumbler, sear, bridle, springs) made and fitted, frizzen replaced with one that pivoted on a pin from the inside, topped off with a new double-throated hammer.
Not cost-effective, more of a nostalgic exercise in what I wish I would have known how to do to "fix" a Dixie lock 20 years earlier. Had it been on a rifle, Kevin's approach of replacing it with an L&R RPL lock (with some tuning) is probably a better plan.