Cartridge protractor- the best?

Couldnt agree more with yip's mintlp. Highly accurate . Need bright light & suggest to set up with a 10 x 20 monocular

Can someone please explain how any of these alignment protractors being discussed that use line of sight from spindle to pivot can be as accurate as a protractor that uses an arm and pin/nail (Dr. Feikert or Clearaudio) that locks the protractor to the arm's pivot point ? Seems to me using line of sight, it would be easy to be off by a few millimeter's either way, resulting in an inaccurate cart alignment.

Rockitman, The arc protractor is a replica of the arc the
stylus is supposed to trace (aka 'eff. lenght') along the
record. On the Mint tractor you have also the 2 nul points.
The spindle - pivot distance determine where one need to
drill the hole for a given tonearm. Ie the arc protractor
'assume' that the spindle-pivot distance is already correct. All 'ordinary' protractors are made with this assumption.

Regards,

Hi Nandric...so using a feikert as an example, the arm that touches the pivot point is only for getting the correct spindle to pivot point distance and has nothing to do with adjusting the zenith (offset) angle ? In other words, as long as the protractor is on the spidle, no matter where the platter moves, the null point alignment lines will be correct ? This now makes sense to me...duh

If this is the case, I need to get that mirrored protractor to better see my cantilever which is shorter than normal along with being a low riding cart that makes it very difficult to see the cantilever head on with the needle down on a traditional protractor.

In other words, as long as the protractor is on the spidle, no matter where the platter moves, the null point alignment lines will be correct ? This now makes sense to me...duh

actually on further thought, this doesn't make sense to me...The line of sight line on the protractor used to align the protractor to the pivot point seems prone to error. What am I missing ? TIA