A woodpecker on a branch that pecks its way down a tree trunk (or axle rod), making a tapping sound.

This is achieved through a flexible coupling unit vibrating in a handrail coupling which slides down the axle rod.

The woodpecker (pawl, fork piece, handrail support, 1” rod) is mounted on the coupling unit.

A minimalist model — it uses only two nuts and bolts!

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