Hi Burch,
Very fine steel wool or a very fine scotch-bright pad will also work as long as they are lubricated with linseed or mineral oil. Same goes for rottenstone. Take a small square of high density foam like the foam used in thermal pads for camping, and wrap it with cheese cloth to make a "rubber". Dip the rubber in oil then the rottenstone and rub the stock until the slurry begins to thicken. Then wipe off the slurry and repeat. Do not press hard. However, the key thing is to let the finish dry AND cure before trying rub it back. Curing may take over a week or more so don't rush to rub back the stock otherwise you will rub through the finish.
dave