Mecanum wheel wobble (not runout)

[DougJensen]

Hey folks - We seek advice on mecanum wheel wobble/precess (not runout). Our brand new set of 8" AM wheels produces about 1/8" left/right wobble at the wheel radius when assembled using the supplied internal spacer and a 550 plastic spacer/sprocket.

Not having prior experience with this drive, I'm not sure if this is a problem, but it seems odd to have so much - and this wobble translates into a sprocket wobble (although about half as much at the sprocket radius) - that is way more than I'd accept on a standard linear wheel mounted sprocket.

We've had several MEs look at this and try the assembly process themselves, along with using a torque wrench to properly tighten the sprocket in a proper bolt cinching pattern. All result in the same amount of wobble/precession. Any help would be appreciated, but we do not have the luxury of moving away from a sprocket drive.
Thanks! Doug