Simple mount for easy Z-axis home adjustment. Designed to work with Std. mechanical endstop mounts for 8mm rods. Used on about 10 prints now and repeatability is great. Requires some drilling of X-end to attach. Uses a 3 x25 mm bolt and nut, two 3mm washers and Ink pen spring. Not sure of mounting screw size but Diameter is slightly less than 4mm (see Pics) need two. Need one slightly modified? just let me know and i will try to provide. Enjoy