Check with a gunsmith. My usual spare parts places do not have hammers for the Davis derringers in stock. It may simply be a matter of luck in finding one. Sorry-
All these 35 75 dollor bs they must me worth 300.00 that's what I just got for one unfired box and history not 35 75 they 300.00 now think virus not 20 yrs ago ha
I had that problem. make sure the gun is unloaded then try something like PB blaster. now if that doesn't work remove the grips and soak the gun in diesel fuel and if that doesn't work try a 50 50 mix half cheap transmission fluid and acetone. now if its blued, it will remove the blueing. hope this helps