Feickert Protractor - anyone use one?

Yes Stiltskin, when I set up the Copperhead with the Feickert (20 minutes), it then follows the arc of the Wally Tractor (Baerwald)....perfectly!
Regards
Henry

More time for whisky and music :-)

Sorry Stiltskin if I was unclear.
If I try to set up the Copperhead by adjusting the cartridge to follow the arc of the WallyTractor which (correct me if I'm wrong) has the same mirrored base and inscribed arcs as the Mint, I can't seem to achieve a perfect match without taking hours and hours.
However if I adjust the Copperhead using the Feickert and THEN run it over the WallyTractor arc, Le Voila!!!

And yes you are right......the proof is definitely heard in the playback.

I humbly disagree with Stiltskin and Doug.
Alignment is only one of the functions possible with the Feickert. For me the greatest benefit is setting the spindle to tonearm distance accurately which allows the absolute effective tonearm length and overhang as specified by the tonearm designer.
Only those with adjustable (swinging) armboards (as on the Ravens), will appreciate this function but with the Feickert it is possible to get these accurate to 0.2mm.
I have the DaVinci 12"Ref Grandezza tonearm which comes with the Feickert complete with the set-up platter with one side dedicated to the DaVinci and the other side applicable to all arms.
I also have the Continuum Copperhead tonearm which comes complete with a dedicated Wally Tractor.
When I set up the Copperhead using the Feickert, I obtain 99% accuracy when I then test it against the Wally Tractor.
However when I try to set it solely using the Wally, I can achieve little better than 90%?

Nice one Doug.
Having been in the building industry for 40 years, I can assure you than trying to 'eyeball' a hand-held ruler over the dead centre of a 4mm diam shaped spindle at the same time as 'eye-balling' a mark on this ruler over an ill-defined tonearm pivot hidden by the tonearm is no more accurate than a generic 2 point alignment card downloaded from the internet.

The Feickert 'locks' in both spindle and tonearm pivot and is attached to an aluminium 'beam' which has NO deflection compared to a wooden, metal or plastic ruler over the same distance.

It seems a little odd to be so adamant about 'thinner' etched lines and parallax error compensation of the mirror backed Wally and Mint protractors whilst at the same time proposing such an inaccurate method of effective length and overhang measurement?