More cogitation: now the ratchets can be dispensed with. Each ratchet can be reduced to a single tooth, and that tooth placed on the end of a spring loaded arm. The neat arrangement of wheels around wheels becomes a bristly mass of hooks and spines. Should be simpler to build, and has less critical tolerences. It does however, lose the victorian steampunk look. I can probably replace the central 'heartbeat' wheel with a linear ram - which would be easier to power with steam or pneumatic power.

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