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Registered
Join Date: May 2004
Location: Boulder, Colorado
Posts: 7,276
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You got me on stones.
The video I saw used the existing arc of the rocker as the method of retaining that arc. The rocker was moved by hand, and by twisting it and moving it in and out, its face was ground. The shaft kept the face parallel with the grinding surface at all times. The idea appears to be not to remove too much.
I've cleaned up some rockers with wet/dry 1200 or so grit sandpaper on a piece of window glass - sort of the same thing, though if the rocker surface is not parallel with the shaft axis this won't change that.
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