I have a Paterson revolver. It's marked Replica Arms Inc. Marietta Ohio made in Italy. It's stamped with the code XXII. I believe this means it was made in 1966 possibly by Uberti. My problem is that it has a broken sear screw. I ordered a Paterson sear screw from Dixie but it's not threaded to fit my version of the Paterson 36 Cal. revolver. Where can I find the part?