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Tim, the rotation is on a clutch-type mechanism; you can stop the rotation with firm pressure, but with light to moderate pressure it rotates. I wasn't aware of that when I bought it but it's done fine so far on a couple of light sanding jobs. You've got me worried now that it won't do well under heavy load.

Frick, I guess I better take back my advice to buy the 7424 until I find out how good it is on the tough stuff. Sorry about that.