I also use strips of cut bike tube to make spacers since you can get the exact space needed. You can use Elmer's No-wrinkle Rubber Cement to adhere the layers together once you get the length right. It doesn't mar paint and leaves no residue. I bought an 8 oz jar from an office supply store. It's the same stuff found in patch kit tubes but a lot handier when you need to patch a tube and way cheaper in the long run. Just clean it off any excess with a cloth. A lot of tapes leave adhesive residue and ooze adhesive in the heat. Rubber cement stays put.