I just bought an Alesis photon x25 Midi controller. You know, the one with the wacky "dome" controller?
This one has seen better days, needs a good clean, some marker pen removed, and a couple of knobs are missing: the volume control and one of the controller knobs.

Does anyone have any I can buy? There's nothing on eBay: I checked..

Maybe other Alesis knobs will fit? I don't know..
Click image for larger version. 

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I highlighted the missing knobs..click image for larger version..