Cartridge alignment tool

I'm sticking with my Wally Tractor for my Rega. It works perfectly for me. I like the mirror surface and the etchings. I can align my turntable in about 5 minutes.

http://www.accutrak.us/index.html
I use this and it's excellent!

Another for Geo-Disc from MFSL.   It's simple and works nicely.  I've been using it for years.

I have a Fiekert, recently used it to finish up after I had used My Geo-Disc as a rough start on a Soundsmith cart .The difference was so little it was impossible move my finger such a minute difference .
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GeoDisc and related products does not have a Pivot to Spindle Ruler, so i have NO IDEA how do you guys are using such products if you're gonna swap a tonearm ??? Maybe it's good for ONE fixed tonearm on a turntable, but devices like GeoDisc are useless if you have many tonearms. Precision pivot to spindle setting is the first step for any toneam setup. This is the reason why Dr.Feickert is always better.