Feickert Protractor - anyone use one?

I've used a Fiekert tool over the years on several tables to great success. I just bought a new alignment "block" for $50 that is another great tool when verifying cartridge alignments.
 http://www.audioasylumtrader.com/ca/listing/Phono-Cartridge/Azimuth-amp-VTA/Alignment-Block/-12-unit...