Damn, fast forward got there before me, but my guess is it's for drilling and reaming peg holes. The block held by the G-cramp goes between the pegbox
walls and stops the grain ripping out on the inside. The jig with the hand clamps holds the whole thing together. (Presumably you're reparing the
pegbox without actually taking it off). I can't see a third element and haven't a clue what the paper is for.
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