pwa wrote:One big plus for the threadless system that prevails at the moment is that if something goes wrong it is nearly all external and accessible, not hidden half way down a narrow tube.
That's the problem I've got at present with one of my bikes.
I've got the (cromoly) stem out OK (without any difficulty, once I'd completely removed the bolt), but the wedge at the bottom is fairly solidly seized in place, half way down the steerer. The stem itself was greased, but I'd missed the wedge.
I think chemical persuasion is in order, once I get round to it.
I had the same "failed to grease everything" problem another time with a UN72 BB. I'd greased the threads, but what seized was the inside of the adjustable cup against the cartridge body, which I hadn't greased, relying instead on whatever white stuff it is that was already present.