I used Feickert Protractor to measure S2P distance on my VPI Classic 3 and I got 258 as well. I tried both VPI protractor and MintLP and slightly prefer Mint's result as well.
I looked back at my email with Yip and he did not mention what he used for my JMW 10.5i arm (I ordered his mintLP while I still have Classic I, I use the same protractor for my Classic 3 now, assuming that it would be the same).
I looked back at my email with Yip and he did not mention what he used for my JMW 10.5i arm (I ordered his mintLP while I still have Classic I, I use the same protractor for my Classic 3 now, assuming that it would be the same).