I remember some years ago listening to a PU2-equipped LP12 and being bowled-over by its sound.
It's a shame, to some extent, that Linn and Naim had the hegemony on what arms went on the LP12, as there were a number of other arms which fell by the wayside as a result, I think, and which worked at least equally as well in my opinion. Syrinx, Mission, Zeta and Helius spring to mind straight away, and I'm sure there are others. The PU3 isn't as fiddly to set up as the PU2, and has a very nifty and well engineered - if slightly frightening when using for the first time - threaded arm tube, which revolves in order to adjust azimuth/alignment.
I'm not certain, but I think my NAS may be the only PU3 equipped one in existance, as when ordering I provided the spindle to pivot distances, and Notts claimed never to have heard of it before. If anyone feels like trying something different on the Spacedeck, and can track a decent PU3 down, I would highly recommend it.
Anyway, apologies for the hijack of your excellent thread - I hope the Spacedeck continues to impress you, as it has me over the last 3 months.
Chris.