Wow is that the case for most air shocks then, that the uppers you see are not the actual air piston inner? I didn’t realise.

Re air forks. I sent my air shock in lately – £100ish for a basic service as the damping had gone. Had to pay an extra £30 for a new piston as the old one had a tiny, tiny chip in it that would lead to seal damage and air leaks. Presumably a similar problem on air forks would cost a lot more, due to the large size of a CSU assembly?

Hence (Beveled Edge) thanks but I’ll hold on your offer for now, unless the steerer on your forks is uncut, in which case I’ll consider – though I’m still not sure about air springs…