A sheet of 240 grit wet and dry on a flat surface, glass pane etc. Lubricate with Kerosene or similar. circular motions or figure of eight, not back and forwards. Check with a straight edge.
A sheet of 240 grit wet and dry on a flat surface, glass pane etc. Lubricate with Kerosene or similar. circular motions or figure of eight, not back and forwards. Check with a straight edge.
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