Cartridge alignment tool

I've used CartAlign, Dennison protractor, GeoDisc. I am currently using CartAlign. 
Any alignment tool used is better than no alignment tool used.

Re: Using the Mint.....When I got mine, he recommended and I got a 50mm Magnifier. #7501.    I would say this is nearly a necessity to get things right.   Without the magnifier, I was just a bit off the radius, with the magnifier, spot on with no effort.

I have and use the Uni-Pro- I like it a lot. I also setup tables as a service so it makes sense for me imo. I am sure the Feickert is fine too.

+1 that the whole process of dialing in your cart is way more than the basic alignment

I've used the MoFi GeoDisk for years. It is just really well thought out and makes alignment a breeze. 

Remember whichever method you use to lay a Q-tip crosswise under the cartridge as this is perfect to align while protecting the cantilever from harm.