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A torch is going to torch the paint, so that's a bit of a last resort. Not sure I can be bothered with that, though it'll give it a nice "rat" look? ;)
But maybe some gentle heat on the electric hob can work?
I could put the metal stanchion bit at the bottom on the heat so that the painted outside tube doesn't get direct heat. The steel should heat up and the inside tube should also get hot, heating up the bearings and other bits I cannot get to.
Not sure that is quite "hot" enough though... my partner thinks not and he's more into mechanical engineering than I am.
I was wondering if there was anything that would melt or dislodge the bearings, cages or races out whilst not damaging the structure.