Clue to Riddle #84: Twiddled Bolts

84. Two identical bolts are placed together so that their helical grooves intermesh. If you move the bolts around each other as you would twiddle your thumbs, holding each bolt firmly by the head so that it does not rotate and twiddling them in the direction shown, ill the heads a) move inward, b) move outward, or c) stay the same distance a from each other?
Interlocking Bolts orbiting each other
Consider the arrangement below where a specially designed bolt has single ridge going in a loop around it, what happens when you twiddle them in the direction indicated? Imagine the opposite arrangement: a special bolt with just a flange on the end interlocked with a regular bolt

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