I've not tried it on my RO125, but I would think you could just stick a Scotch Brite pad on the hook & loop pad of the RO125 or 150, trim it round with a pair of old scissors and you'd be good to go.
For initial polishing I do just that with a chunk of jute back carpet removed from our living room when the carpeting was replaced. The piece I kept was just like new, since it was originally along the wall, beneath a large book case. I wouldn't use it for finish polishing, but for the initial polishing after removing orange peel and such with sand paper (I usually go to 800 grit) with the red heavy duty rubbing compound, it works great and costs almost nothing!
