Dear Lewm: That azymuth changes through the tonearm collar ( SME removable headshell type. ) is an old trick for that kind of tonearms that were not designed for azymuth changes. It is a pain to use it because was not designed for that purpose.
In those all times clever/wise/knowledge Japanese tonearm designers ( there were not many, few very few. ) took in count the azymuth subject through their designs and from the ones I remember ( I own those tonearms. ) only Lustre GST-801 and Audio Technica ones ( they builded different models. . ) came with this azymuth control by design through the original Lustre and AT headshells, just like the Raven today.
No, Dynavector, SAEC, Micro Seiki, FR, Technics, Audiocraft or Denon thinked about.
Lewm, try to find out a Lustre one: this japanese design was IMHO one not only of the best tonearms out there but a design several several years a head any other tonearm design: even the ones today and you don't need to pay " stupid " high prices for it: this IMHO and talking on tonearms is a real/true century bargain ever.
Regards and enjoy the music,
R.