Fisher Delta Optical Axis endstop for Gen7

This is a mod to upgrade the original axis endstop micro-switch (+/-0.1mm) with a gen7 type optical encoder (+/-0.015mm). These are pretty cheap off ebay ( £7per 3off at time of writing).
The tab is fixed to the carriage & breaks the beam of the optical switch. It is long enough to work with the slight overtravel during the Fisher datum routine.
I printed the blocks in pla & friction welded them in place with pla filament & dremmel. The endstop is screwed into the holes in the block using wood