If you scroll to the bottom of this Vinyl Engine Protractor page you will find a protractor specifically for the Technics table.
I have downloaded it, but it needs to be magnified to fit the scale printed on the protractor, and it does not fit on 8.5"x11" paper (obviously...as no protractor does). So, I suppose it's a cut and paste deal, unless you can take it to Kinkos and have them print it out on large, heavier card stock. A poster above uses this protractor. Maybe he'll offer more guidance.
You are correct that the Technics overhang tool and another protractor will produce physically different mountings. I have no explanation for why this is so, except that the mounting distance on the protractors is probably longer because most arms have a longer mounting distance than the Technics' 215mm (Regas are 223mm). This is a wild guess on my part.
I presently use a Benz Micro Ace, which was aligned with the two point protractor provided with the HiFi News Test LP.
I have downloaded it, but it needs to be magnified to fit the scale printed on the protractor, and it does not fit on 8.5"x11" paper (obviously...as no protractor does). So, I suppose it's a cut and paste deal, unless you can take it to Kinkos and have them print it out on large, heavier card stock. A poster above uses this protractor. Maybe he'll offer more guidance.
You are correct that the Technics overhang tool and another protractor will produce physically different mountings. I have no explanation for why this is so, except that the mounting distance on the protractors is probably longer because most arms have a longer mounting distance than the Technics' 215mm (Regas are 223mm). This is a wild guess on my part.
I presently use a Benz Micro Ace, which was aligned with the two point protractor provided with the HiFi News Test LP.