Iguanadon

Hi Scott. I had the same problem with my new set of Pegas clamps. After about two or three months the upper clamp started slipping and I could not make it quit. Pegas MG # 3. I contacted the place where I purchased the clamps and they sent me a new set of tips for the thumb screws. Problem solved. It has been several months and many hours cutting and they still work fine.  You might try the ones out of your Dewalt I believe they are the same size to see if that fixes your problem. I tried the sanding the tips as well, that did not work for me. When I had the problem they actually had two or three other customers with the same problem. The tips were the culprit. good luck I hope you get it fixed.

grizz

Duane Sidebottom