Ooh, excellent, thanks Becky !
(I must admit I wondered if you or Dave L might reply, couldn't think of any other SPM owners..).
Yeah, it's just rotational notchiness..your pics explain why I couldn't see any bearings in the SPM manual, 'cos they didn't show 'em..
From reading the SPM manual it sounds like the lower bearing seats on a change of tube dia. - ie like a fork crown, and that the upper bearing is seated at the right height 'cos it sits in the top of the headtube, but has nothing to locate it in height on the inner fork tube otherwise. Do I have that correct ?
The implication from the SPM manual is that I should to get an assembled fork back in the headtube without the aid of a drift (removing spring etc), but it sounds like in reality a bit more violence might be needed..