I've been practicing impressioning for the last few nights, and I've been running into some problems with the cylinder that I'm working on slipping in the vise, as I'm putting a lot of pressure on it. Is there something I can use between the cylinder and vise jaws to secure my work? I tried 2 small peices of softwood I had lying around, but I'm thinking that there must be a commercial product out there. I'm thinking something rubberish would be ideal...
What does everybody else use?