Wobble Wafer eliminates Z bandings by decoupling XY wobbles due to imperfect T8 lead screw from Z motion.
No flat surface contact. Smoothly wobble with ball bearings inside. 9.5mm height. 31.9g including bolts and nuts.
It has threaded hole patterns of a T8 lead screw nut at both top and bottom, thus fits SK-Go 1~3. Just treat it as a spacer of the lead screw nut.