Get your CNC squared up and save $$. Print this, insert 2 gauges (from eBay http://www.ebay.ca/itm/182139148734?_trksid=p2060353.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT), and thread in a 1/4-20 threaded rod. Search YouTube for videos on tramming tutorials (https://youtu.be/DmuipSuDNAs). Designed to fit 2-1/4" dia. body and then clamped with M3 (or imperial eq.). Mined printed a bit tight so they friction fit just fine.