chris
the feikert is a well crafted piece and a welcome addition to my audio analog tool kit
your spindle to pivot length work is fabulous
and well worth the price for that alone
the grid under which you align the cartridge is nearly impossible to site correctly. The grid lines are distracting not complementary. You can get close for a lot of cartridges and should be commended for that, but it's hard to accurately square and for very sensitive to alignment cartridges like my ZYX Universe I needed further precision
the mint uses paralax site line effect - you know when you are perfectly aligned and is much more precise in it's alignment measurements
then again it is made for each specific table and arm setup
I own and use both - feiker - pivot length
mint - fine tune alignment
for a quick setup of a friends table - the feickert worked good - a very adaptable piece. I used it exclusively with good results on my previous table - Nottingham Spacedeck
to get the maximum finese out of my galibier/triplanar/universe
a custom made mint protractor was necessary and worth every penny