You might want to try 5 star pawn in upper cumming. I used Jason I think that was his name to fix an old colt revolver. He was good. I might have the stores name wrong but it’s either 5 star or 5 Diamonds. Good luck
When I used KOIL. I give it time and will administer it with one of those baby medicine eye droppers like twice a day for 2 to 3 days. Never had it fail