Woaaa! Way to go! I just bought a new one so just happen to know what those little spikey wheels are for (I have the booklet). They were SUPPOSE to be for lifting the nap on your carpet after scrubbing it. Now, I picture me, on hands and knees, working over my entire living room with the little scrubber dealy-o, then going back again and lifting up all of it's nap---I think NOT! What a nightmare picture.
I don't know what B&D was thinking with those parts, insinuating that you would use the machine for anything besides small areas, but it sure makes a great sander for us PC fiends. And now, you have found, IMHO, a MUCH better use for that particular attachment (rummaging around for my hacksaw and velcro now.....)