How much side pressure is required for the hold down rollers on the y axis. That is, the manuel states slight side pressure? With good contact on the rails should they be able to be turned by hand without moving the carraige, or should they be tighter. The reason for my question is I am getting a bit of chatter when I do smaller radius cuts 4" or smaller. I have moved the Z as close to the pinion side of the carraige as I can, and that helped alot but I am shooting for perfect. Any Ideas. I have taken steps to make sure everything is aligned (square) as good as I can get.