Where to find uni din protractor

Fleib,
Did you ever try nulls at say 70 and 124 for lower outer distortion?
Thanks for the Uni-Din nulls - I'd presumed they were around that, similar to FR66.

Tawa,
Do keep in mind that small errors in offset and overhang can lead to big errors in distortion at different points on the record, or not, depending on whether they add or cancel.

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,

to be clear; I have never had any personal dealings with 'dertonearm' Deitrich Brakemeier. so the 'mike' Unoear is referring to is not me.

if you have lots of time on your hands and want to read up on the conflict Unoear refers to; here you go..

further; Unoear sold the Rockport I sold him to a gentleman in the U.K. who happens to own 3 other similar Rockports. I did not buy the Rockport back from Unoear.

dertonearm and Syntax convinced Unoear (as described to me by Unoear at the time) there was a problem with the Rockport tonearm ( never clear exactly what it was), and then dertonearm sold him a bill of goods which is their conflict. I was the easy target to attack. the U.K. buyer of the Rockport (who is a friend) reports that all was and is well with that same Rockport tonearm.

I've moved on and hopefully so has Unoear. i certainly wish him the best and understand why he was upset at the time.

Fleib,
I have advised Rega owners to try a similar alignment which avoids having to slide the cartridge overmuch.
http://odysseytonearms.blogspot.co.uk/2011/09/stevenson-alignment.html
But as you say, it means more distortion on the outer inch or so.

For albums recorded right into the label, it also depends whether that last track or movement is a quiet one or a loud one, and what profile stylus is used.

I suppose it all does highlight the fact that every alignment is ultimately decided by the inner and outer recorded radii and LPs don't fare well in that regard: an alignment for seven inch singles played with an 8" arm will have less distortion than any LP set up...

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,