I can't remember where but there are lathed wheels available for those. I've never built one before however I have thought about it. If your kit uses eyelit screws for tracking it might be possible to clock them opposite ways to reduce some of the side to side slop, maybe highly polish them and apply Teflon spray. Maybe 3 wheeler? And I also wondered if slightly heating the canister by holding in your hand before installing would increase pressure slightly. Just thinking out loud.
