Hi LRT, it is a bit of a silly belt adjustment on them with the 3 hole setup, doesn't allow for fine adjustment. I also think the front pulley is worn and the belt might be bottoming out. I can't remember how that pulley comes out and I do have another Anniversary here so I could check it out but it is surrounded by mowers and at the moment they are driving me nuts, everybody wants a cheap mower, something to do with the grass growing I believe. They all seem to wake up one morning and the grass is half way up their fence so panic sets in.
