I am also working ona Wells Index Model 845, After dis-assembling the quill and getting it to move freely, I finally have it all back together and powered up with my VFD. I ran the mill slowly and the timing belt is slapping around and is very loud. I don't think there is any adjustment on this timing belt? Is there an easier way / best method to re-assemble this timing belt and pulley /drive? Does this mean that I need to replace this timing belt with a new one? Is is possible that this timing belt is stretched and worn out? Thanks for all of your help