My dad has a S&W revolver. He likes to shoot it single action but the checkering on the hammer is so rough it wears through the skin in his thumb in short order. I tried it myself and he is right, it's very rough, you could even say a little sharp. My thought was to get out the Dremel and smooth it out a bit. I'm not a gunsmith and I'd like an expert's opinion before I take a power tool to a $600 revolver. Thanks!