Dear Sir,
Inasmuch as you are here in the states, you might want to give Jack Haugh a call. He is a custom gunsmith of the highest order. His work is impecable. (prices are high but the work is perfect) He could re-llne it and prob even re-regulate. IF Jack can't do the work I'm sure he could direct you to someone of his caliber that would.
Good Luck, SP2 (Jack's ph. # 812-654-3209)