Turntable advice / opinion on setup / sound.

Dover says the Rega arms are designed for Stevenson alignment or some near approximation.  I have found the same to be true of my Dynavector DV505 and 501 tonearms, Stevenson or near to it. However, your and my Feickert protractor is calibrated for Baerwald or Lofgren.  I think mine has different gradations on each side of the white disc, one side for each of two algorithms. But neither side is calibrated for Stevenson. You would have to twist the cartridge in the headshell.  I really don't exactly know why E is hell bent on knowing the null points in mm.  You don't need to know them if you do know overhang (14.5mm) and P2S (222mm).  Dover even stated the headshell offset angle.  With those data, you can calculate the null points, if you must.  VE has it, as Dover said.  I believe John Ellison over on Vinyl Asylum also has created a calculator which he shares freely. I would hate to have to align a cartridge knowing only the null points.  The null points just fall out wherever based on the accuracy of P2S, overhang, and headshell angle.  By the way, a little zenith error and you are wrong all the time anyway,

Bill

I don’t understand.

You draw an arc at 222 mm.

You figure out where (on the 222mm arc) the counterweight will fit (when in the arm rest) inside the dust cover when closed

You drill a proper sized hole.

Lewm

Then, you ascertain the specs for THAT ARM

overhang _____

inner null point _____

outer null point _____

The makers have specific recommendations

ANY protractor with a variety of lines can work for any cartridge.

No math, no calculations, just twist the cartridge (retaining proper overhang) and make the best compromise of the two null points you can and tighten the screws.

It’s ridiculous how long it took, how much persistance was needed, to get the simple answer.

Now, if anyone asks, we can help them mount a non-rega cartridge in a rega arm!

I like helping people, that’s why I was hell bent on getting the simple measurements.

Yes, well please don't be offended, but the simple answer for me is to use Rega cartridges on Rega turntables.  If I wind up buying a Rega TT that is what I would do.  There are many other excellent options for other brands of cartridges.  

bill,

I'm not offended, there have been several members lately who want to do this.

Apple and Rega may make terrific products, they are both proprietary greedy, neither one will get a dollar from me. 

I would rather run out of gas than buy Exxon, since the Valdez.

Exxon Corporation had nothing whatever to do with the Valdez tragedy.  The company spent a lot of money in remediation, however.  Your animus is misdirected.  The ship went off course and ran aground due to human error.  Now let's talk about turntables.