An arm which attatchs the the side of the Z Makerslides. Holds a standard ABEC bearing (Out of skateboard Etc) 22mm OD, 8mm ID, 7mm H. Have to replace the 8mm threaded rod and increase the length to maintain 150mm Z travel. I cut the rods to match the height of the makerslides. Used a thin layer of thin tape to ensure the rod sits snug within the bearing centre. Align the z motor once the bearings are installed. Not recommended unless you are using a floating z nut modification (Z Wobble Stabiliser)