Hi, I've a couple of Templar tillers to play with. I've been trying to find suitable belts for them without success. the problem is that on number 1 the nearest belt I can find, and a direct replacement of the one it had, it is constantly turning the blades and yet when it's engaged it slips! and on number two I cant get one to fit at all! it's either too tight or too loose. I've now got a peg full of belts that vary by 5mm and are no good to me. Is there some kind of magical spooky formula to get the right belt known only to the few?