Loose Eccentric spacer


Staff member
a 10mm wrench should be able to turn that spacer. One side has a dot, when the dot is pointing away from the 8020 rail, that is the tightest it can get. If it is still loose, try tightening the two on the other side of the 8020. But other than that, the only way to adjust it past that is to rebuild the x-axis arm.