if you want to spend $110 of piece of etched mirror - go for it
WRONG! You know nothing about the MintLP protractor. It is not etched glass. The protractor is printed on a plastic sheet that is attached to a glass surface. By doing so the lines are actually above the surface and this enhances the parallax affect. The laser printer used is far beyond what anyone has in their home or office.
Just put you cartridge square in the headshell (use caliper if you want) and measure the distance of 52mm from the connection.
WRONG! AGAIN! Many of us have tried to measure pivot to spindle in just such a manner. There is absolutely no way you can be as accurate trying to measure this as hitting the lines on the MintLP protractor. Much of the accuracy here comes from the way any arch-style protractor works. What sets the MintLP apart is the precision of the lines, both in the arch and in the fineness. Even so, getting pivot to spindle spot on is still only part of the story with proper alignment.
And don't forget, those engineers at Technics where only concerned with getting some high percentage of these arm/cart that went out the door just close enough to sound good. Getting one to sound great is up to the user.
So if you want to shoot holes in something you know nothing about, go for it. But please be a lot more intelligent about it.