These brackets will allow you to mount a mechanical end stop switch to your Mendel.(1) Mount mechanical switch to bottom plate (2) Bolt top and bottom plate together loosely (3) Install assembly to Mendel Z Rod smooth bar bracket (4) Adjust bottom bracket so that switch activates where you want it to and tighten bolts to lock the bottom plate in place. (3) Tie wrap wires in place using the 3mm holes in the top plate