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Gotcha. My bad, I missed that part and wasn't certain if it was a rotor/hub combo.
Maybe clean the hub bore and seal exterior with brake cleaner and apply a little bit of sealant of some type to help it stay in place instead of flop around on install, and also in hopes of preventing any grease from seeping? Not sure what I'd suggest, but maybe others can chime in whether it's a good idea or what product you might use.
Richard