[Arran]

Idler wheels can be rebuilt, if you can find a source of the sort of seals used in automatic transmissions. You don't have to get the original cartridge rebuilt as it can be replaced with a more modern substitute. I don't know where you would find a replacement mercury switch if you needed one, I recon that a micro switch could be suitably fitted to preform the same task. In my case the platter needs to be reflocked, but I put the restoration on hold because the set has a tracking problem with the dial which I haven't solved, so the set went back into drydock.
Regards
Arran