Luckily I found a 1 inch smaller belt. Works great now. No belt slippage, and I have room to adjust the tension if I get any stretching of the belt in the future. The 6 inch disk is not perfect but better, and at least usable. I plan on getting a 12 inch disk sander one day anyway, so this one will suffice till then. Plus I have one on my Grizzly 1x30 that spins straight and true.