Use setting tape and the Filling Station sells it. Don't use a clamp. When I bought my tape it came with instructions. It also comes in two sizes so make sure you are buying the coreect size. Run your tape in the glass channel and then use a Q-tip soaked in motor oil and swab it on the tape. After the tape is oiled then insert you vent glass or door glass and let it sit for a few day in sun and the tape will expand. After the tape has expanded then trim the excess tappe from the edge. I hope this helps...Oscar

Focus, I can't remember if you put the oil on the metal first or the tape but the instructions will tell you.