As Found
The wheel on the left lost several teeth, probably when the mainspring broke. The wheel on the right is a donor.

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During and After Repair
For this repair, the gear rings were separated from the spokes on each wheel and the donor ring transplanted to the original arbor and spokes.

The assembly was joined using a technique that is similar to floating disc brake rotors. Soldering was another option, but the heat would likely anneal (soften) the teeth, potentially leading to a repeat failure.

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