Summary

This red bracket shown in the photo enables one to fine tune the Z axis height on the Mendelmax 3 D printer

Install a capscrew 3mm with a nut locked onto the cap head

Use a small hex wrench to micro adjust Z Axis home height

I did not drill or tap the center hole as the 3 mm cap screw screwed in nice and snug into the printed hole......so no need for a lock nut!