Quote:
Originally Posted by Synchro909
I believe the grooves are not there for anything to do with lubrication. It is more to do with the way they were made. A strip of the appropriate alloy steel was twisted into a cylinder, ground and hardened. The grooves are a result of the winding/twisting process.
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My memory agrees with this - it gives the bearing some "give." Like the bearing rolls on "springs?"
The fit is a bit "loose" IIRC. Like 0.015? The axle shaft actually hold the drum perpendicular to the backing plate as otherwise a fair amount of tilt of the drum would be possible.
Joe K