zRod-2-Stepper Coupler w/3 Grub Screws for Prusa Mendels

I found that the Z-Rod coupler for the Prusa Mendel didn't hold well so went back to the drawing board.

Wanting to be done with it and move on to printing with the Prusa ASAP I took the existing "608 Ball Chain Idler with matching Pulley Hack" and 'differenced' out the 'pulley' portion and exported the .stl

Then Changed the shaft diameter to 8mm (for the zRod) and output that to .stl, Flipped it over, and combined then in Rhino. (one stl object on top of the another effectively bonds them