Where to find uni din protractor

Tawa,
"I am sure that if you wish to experiment without spending a lot, it would be possible to use the free Chpratz protractor from VE."

Are you familiar with Chpratz? It's a straight line from the spindle with a calibrated grid the whole way. Uni-Din nulls are 63.3 and 112.5mm. Here are alignment error curves:
http://www.analogplanet.com/content/uni-din-versus-l%C3%B6fgren-b-just-clarify

Maybe the alignment could come in handy if there's not enough headshell slot length to use one of the Lofgren alignments? Alignment error seems particularly noticeable (to me) at the beginning, and uni-din is the worst there of all standard alignments.

Regards,

John_gordon,
No, never tried an alignment that optimized the outer part of the record. I have a few albums with extra long sides and the groove goes nearly to the label. I don't think they'd fare well with such an alignment.

Uni-Din might come in handy in a situation where you run out of room with the headshell slots, to make a particular alignment. Like with an arm designed for Stevenson and you would prefer Lofgren B which requires 2-3mm more overhang, depending on effective length. 63.3 is a lot closer than either Lofgren alignment. Perhaps popular with Rega owners and many popular Japanese decks of yesteryear?
Regards,

John_gordon,
Sometimes I wonder about our perceptions regarding our frame of reference. Deviations are judged "wrong", when in fact they might be mostly just different.
I question the use of the term distortion in reference to alignment error, not that it's entirely wrong per say, but it implies more than what it actually is.

Alignment error causes a small amount of phase difference between channels and outside of that I think most of the error is subtractive. Are you aware of any distortion measurements specific to alignment?

How can some people proclaim a straight pivoting arm with no offset as sounding superior? With one null point there must be much greater alignment error. Not only that, the shortest version arm (ViV Rigid Float) is said to sound best!

Could it be that torsional forces on the cantilever cause more distortion than a few degrees of alignment error?
I don't really have an answer here, but it's an interesting question.
Regards,

Audioblazer,
MintLp is an arc protractor, is it not? They're only good if mounting distance is in perfect agreement with the protractor. Best used on factory mounted arms.
Your friend's experience is meaningless to us without specifics. Some people use 2 protractors with the same alignment, to check 1 against the other.

If you know mounting distance anyone can download a free arc protractor at Conrad Hoffman site, or conventional ones at VE. Fancy protractors might be more convenient (I have a Dennesen), but one isn't more accurate than another, if constructed properly, and used properly.
Regards,

Audioblazer,
From your post it's unclear exactly what is better about the protractor, easier to use, a different alignment or what?
Regards,