Sanding Blocks

These are a couple of simple sanding blocks that I made out of some blocks of an unknown plastic I found in a skip (from how it machines, I think it is acetal). The bars are mild steel, with a groove at each end that lines up with the groove that goes all the way round the ends of the blocks. An o-ring sits in each groove and holds the bars tight to the block; the bars in turn hold some sandpaper in place and allow the sandpaper to be easily held under tension so it doesn't move around at all.

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