I'd certainly be looking at a reconditioned unit rather than new, but before anything is replaced and refitted is the engineer 100% sure as why this happened to your supercharger and that nothing else has been damaged during the overheat and what happened to the remains of the gears?
Nothing wrong with buying from Ebay but I'd make sure the seller is pretty local to you just in case you need to use that 3 month warranty!
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