I recently got a Mint for a Rega RB-300 on a Thorens TD-850. 222 worked fine. Dougdeacon's suggestion for finding the pivot point sounds great. You may still need a caliper (a small one) to measure the spindle diameter.
MintLP arc protractor
I'm talking to Yip about a protractor for a Rega RB-300 mounted on a VPI HW-19 Mark III. To verify the desired 222mm spindle to pivot distance I cut a piece of cardboard 222mm in length. I measured from the spindle to the center of the armboard mounting hole. It looks to be spot on at 222mm. Is there a more accurate way to measure so that I can confirm my initial findings?
Wendell
Wendell