The FR-tonearms can only be perfectly aligned with the Dennesen Soundtracktor.
Try with any other alignment tool of today - no matter if Bearwald or not....... no matter if IEC standard - and it will result in a misaligned cartridge and too little overhang thus in a pretty bad tangential curve with the zero-error points being too close together.
Do align them with a Denessen Soundtraktor and precise - absolute precise spindle center to bearing center of 231.5 mm for the FR-64s and 295 mm for the FR-66s and you will get sonic results which will open up your ears and minds.
Dennesen is just a predecessor of Dr. Feickert protractor ?
Or there is any fundamental differense between them?
Here is an old review for Dennesen by B. V. Pisha (Source: Audio magazine, Mar. 1980)
Seems like Dr. Feickert is much better tool today.