I solved the problem by buying an inexpensive floor mat from the dollar store that was large enough to completely fill the space under my sewing desk kneehole (or a bit larger and could be trimmed down). Then I determined the most comfortable place on that mat for my foot pedal, traced around it and cut that hole out of the mat. Put the pedal into the hole made for it and it doesn't travel at all. The mat extends to the sides of the desk from left to right and all the way back to the baseboard. If your mat is too thin and the pedal slips out (like mine did), glue strips of mat (from what you trimmed off to make it fit) all around the hole to make it thicker in that area only. My strips are about an inch wide. Easy, inexpensive fix, and quick.