Powdercoat makes a difference. I’ve had slipping issues where I accidentally had a loose bearing housing, the knurled bearing slipped and ground off the powdercoat (and probably made the bearing housing a bit larger). Also a bit of work to clean the powdercoat out of the bearings.
As a side note, this issue will be resolved on the next model release where we’ve got a better method to secure the knurled bearing side while still giving broad compatibility with a standard frame (e.g. no extra bolts or attachment locations required). I can’t provide details or schedule yet but will keep you posted.