I thought about this moreI don’t know about that. I’m thinking it might be the cleaning materials.
I’m thinking there’s something else in there. I got one of the first Diamond polishers ever built and ran it hard for a couple years. Cleaned plenty of spots off balls like that. Wore out the carpet a couple times, I never got black marks. I did get collision marks tho when it started to rattle when the carpet was crushed down or wore down/
Or there’s some black material (glue) on the backing on the carpet, that I never had. Something under the pile of the carpet that’s exposed that’s transferring onto the balls.
Mcguires and carpet shouldn’t do that. Unless it’s in the carpet and now exposed or someone put some shit in the cleaner and it’s polluted now.
Either is likely. Something is wrong and the only thing touching the balls is the carpet or some shit in the carpet like bad Mcguiers.-
New carpet time either way.
Best
Fatboy
About that 59¢, how’s that coming along?

