For many years, I used a pair of silicon rubber pads that were purchased from Brownells but eventually they wore out, so I replaced them with a pair of pads I cut from a rubber conveyor belt. The material is over 3/8" thick and has a fibre (cloth?) matrix interior, and the pads are stiff enough that they don't require backing with anything...they stand up by themselves. With these pads, I can take a fully finished and chequered gun stock and clamp it in these pads without any fear of damaging the gun, and they do not slip. We have rolls of this belting at our R & G Club...at one time, used it to staple targets to on our big bore ranges.