This is a small endstop mount made specifically for this switch (sells dirt cheap on ebay). You need a switch, 1 mount (you print in favorite color), 2 - M3 Nuts, 1 - M3x10mm, 1 - M3x12mm and 1 -M3x20mm. Assembly is easy. See instructions for more info The 20mm M3 is used to secure the plastic mount to the 8mm rod, use a nut and just snug up, no need to use a lot of force. The 12mm M3 goes in the center hole of the plastic mount(part you print) and is secured by the recessed nut. The 10mm M3 is used on the front of the switch and it self taps in the plastic. You should ream the 8mm hole (5/16 bit) works nicely. Then ream the holes that go all the way thru, using a 1/8 bit. The 3rd hole that does not go thru, does not need reaming, and the M3 will self tap. You should use a 1/8 bit on the switch itself. Carefully, there is enough clearance, but nice and slow by hand. Sketchup file here if you want to mod. The stl has already been run thru netfab! Enjoy!