A piece of scrap leather solved my tong pinch problem
I was working on a set of small S-hooks last week, and my tongs kept slipping on the 1/4 inch stock. I'd get a good heat, start the bend, and then the piece would shift. I wasted three heats in a row. I had a strip of old belt leather on the bench from a handle wrap job. On a whim, I cut a two inch piece, soaked it in water for a minute, and wrapped it around the jaw of my flat bit tongs where it grips the steel. I let it dry on there for about an hour. The next heat, the grip was totally solid. The leather charred a bit but didn't catch fire, and it gave just enough cushion to bite without marring the work. Has anyone else used a similar trick with different materials?