I think it was Gina Perkes on YouTube that was using pieces of shelf liner under her rulers to keep them from slipping. I thought I would give it a try and bought a roll for $2 at the $ store. I used a strip under my Bernina ruler with the wavy edge because I have been having trouble keeping it in place due to the fact that the foot has to ride in both the valleys and peaks. It works really well and all I have to work on now is keeping my stitches even. The shell liner also works well under my regular rulers for cutting. I have enough shelf liner to last the rest of my quilting life I think.
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