Just tell Yip at Mint LP to use the same geometry that I provided him for the JMW 12.7i tonearm. The 12.6 & 12.7 use the same geometry. The 12.5 is a longer arm. Here are the 2 links you need. This project took me a month to complete.
Geometry - http://www.audioasylum.com/cgi/vt.mpl?f=vinyl&m=920405
Nominal Effective Length - http://db.audioasylum.com/cgi/m.mpl?forum=vinyl&n=923584&highlight=jmw+12+7+ nominal+effective+length&r=
Yip should already have all this - I sent it to him directly.
If it were me, I would just use the free Conrad Hoffman protractor. It is just as good as the mint. It does not have a mirror finish.
Geometry - http://www.audioasylum.com/cgi/vt.mpl?f=vinyl&m=920405
Nominal Effective Length - http://db.audioasylum.com/cgi/m.mpl?forum=vinyl&n=923584&highlight=jmw+12+7+ nominal+effective+length&r=
Yip should already have all this - I sent it to him directly.
If it were me, I would just use the free Conrad Hoffman protractor. It is just as good as the mint. It does not have a mirror finish.