OpenAstroTech Samyang/Rokinon 135mm Cradle: 6mm m4 inserts and NEMA17 focuser motor

A mod to Arca Swiss Plate and Top Bracket to use m4x6x6mm threaded inserts. Also focuser mount for a NEMA17 motor. Included step and fusion file for the NEMA mount since it is a complete redesign. Could be easily modified for different motor sizes or mounting. 

I also used these knurled thumbscrews in my build:

https://www.printables.com/model/272115-knurled-m3-m8-thumbscrews 

All other parts are from the original: 

https://www.printables.com/model/153157-openastrotech-samyangrokinon-135mm-cradle-with-foc