I have to say Sal, that there are a few restorative welding companies out there who perform repairs on antique revolver parts, including hammers. I have a hammer for a 44-40 DA Frontier that lost its firing pin. I am about to contact one company with great reviews that specializes in gun parts restoration.
RESTORATIVE WELDING
Museum quality TIG welding of antique firearms and edged weapons ... since 1964