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Dogtemple-
We have this one, works well, though I don’t use it much. Can’t see how you’d end up with eggs unless you’re changing the roller tension mid-roll, or the machine is unwinding it’s self or something.
Just roll several times increasing roller tension each time. Use a piece longer than the final circumference and trim down to size.
Alternatively I’ve had good results just pulling thinner rod around circular ply forms (or big dia tube) clamped to the table
dbr
What are you using to roll them? Black flatbar isn’t very consistent but it should work pretty well with a proper ring roller. I got a firm in the midlands to do these though. Didn’t fancy doing 130 rings by hand. They work to +/-2mm with CNC machines.