Hi,
Thanks for the lead to Nugget.
I suspected the eBay cheapies would be consumable, but even my original Runvar has aged rather than worn, and it was machine from a billet, chromed and laquered.
The rollers are availble in poly, but don't come with the mounting bracket and pins and are $80 or so.
It is not an urgent matter, but using it on Sunday, I noticed it when cleaning up and washing and re spooling the rope.
Cheers