One thing I failed to mention in my last response, which may also be a benefit for the Mintlp Tractor, or ones that may follow it, is the Mintlp Tractor has a very fine Arc Trace, and literal "microscopic" Null Ticks, and Null Grid Lines, permitting I believe, much better resolution, and fine tuning of this critical alignment.
Yeak! Mark you got it
This is the power of MintLP Tractor
You can make a super-very-fine setup , obviously thanks to a good magnifier lens , and when you have finished you are alway sure about the perfect tracking point of your cartridge and you can listen this every time you spin a LP