I've put a couple of videos on my Facebook page - one showing a TD-124 idler wheel having its edge ground back to fresh rubber on a specialist rubber grinding lathe, and the other showing my own method for using a bit of melamine foam block (Magic Eraser) to further 'polish' the rubber rim of an idler to reduce noise down as far as is realistically possible with these things.
Idler refurbishment is not something that I offer on a commercial basis, but if anyone needs a TD-124 idler wheel brought back to life, the cost is usually just the return postage and packaging plus the cost of a new bushing if that's needed.
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