I have Thompson 5/8 linear bearings and 5/8 linear rails for my z axis. The bearings have a slight amount of slop in them. (all are brand new) I Just finished attaching the z axis mounting plate and the router. The slop is now magnified greatly. I can easily wiggle the router up and down. This is terrible, I can move the end of the bit 5/16 to 3/8 of an inch with 1 finger. This is definitely not acceptable. my old machine used abec-7 skate bearings and had far less sloppiness. How do you use linear bearings with success. I'm ready to scrap the z axis and build another with skate bearings. The rail and linear bearing design is garbage. Sorry but I am disgusted with the quality of this set up. If any body has any advice on how to tighten this slop up It will be greatly appreciated. (I tried adjusting the bearings with set screws and when slightly snugged the bearings will not even move on the rails). Thanks for any help on this, Jeff