Jdodmead, thank you very much for your considerate reply and especially for the write-up. I'm sure we're not the only ones who ran into this and for sure, won't be the last.
I did mine the same way, but I'm thinking the headshell actually turned on the arm itself.....might be wrong about that, but I definitely felt the bit of "give" you're referring to and was then able to position the headshell, using a level, to precisely the position it should be in....flat level when viewed atop a record, which allows for adjustment of the azimuth to be spot-on as well.
Using the Polaris protractor, kindly sent to me by someone on another forum, I was able to align the cantilever precisely with the "B" line provided on the protractor with the stylus tip in the small circle (which I poked a hole through with a pin to allow the tip to sink into it). I made sure the line with the arrow was pointing dead-center to the pivot-center before doing any of the adjustment to the cartridge position.
I made the first setting using the "A" hole on the protractor, and when checking it against the alignment using the "C" hole, it was still perfectly on. Nice to know it is now as it should be.
I'm thinking Nottingham likely contracts with a dealer over here, the guy in CA, and wants all inquiries to go to him so it may generate business. That's fair, I guess, but for folks like myself, in Farmington, NM, 10 hours drive from the nearest place I MIGHT be able to get service (Phoenix), it makes it kind of tough. Trouble is, I haven't had much help over the phone and have just stopped calling them as they're always very busy.
Thanks for the help!