I used to have exactly the same TT very many years ago!
Try reading
here. While the TT is a 160 (not 166) it may help. Setting up the arm:
IF the pivot-spindle distance is indeed 215,4mm as specified
here then:
effective length is: 233,19mm
offset angle: 23,6 degrees
overhang: 17,8mm and, of course,
spindle-to-pivot: 215,4mm
Null points at 66 & 120,9mm
(BTW, looking at my old notes I used to have the distance @215mm as well)
Start by getting the spindle to pivot distance right; the offset angle cannot be adjusted -- but it should be correct (sme is a very serious constructor). Then align with correct protractor at null points. If you have already tackled overhang, aligning the cartridge becomes much easier.
Cheers
Cheers!