[R-390] Slug Rack Rollers

[Jerry K]

As a low-dollar winter project I've started rescuing an old high-mileage 
'54 Motorola R-390A from the grave--or at least from the nursing home. 
It's actually in pretty decent shape, but I have one little problem that 
has me stumped at the moment. Obviously this receiver was used as a band 
cruiser, and all that knob-cranking combined with hardened grease 
resulted in flat spots on several of the slug rack rollers. I see the 
rollers are press-riveted units, so I presume they are not replaceable 
parts. Is there a known fix for this, or is replacing the racks the only 
option? I guess I've just been lucky, because the four or five receivers 
I've done in the past didn't have this problem.

I'd like to get this question answered before I tear down the gear 
train, which would be a waste a lot of time and effort if there is no 
reasonable fix and replacement slug racks are not available.

Jerry W5KP