nylon roller source?

[Michael Arruda]

I've been working with a Redsail m500 laser for a little while now and am having an issue with wavy straight lines. I was looking at a mechanical source when I found the nylon rollers that ride the extruded aluminum rails are worn and chipped on the edges. I think this is leading to the issue I'm seeing.

Does anyone know where I can source the rollers? The bearing are in good shape - I plan to do a good oil soak before reinsrall to flush any contaminates.
So, it's dead in the water. Any ideas?

Thanks! -Michael