Mike Berger writes:

I've had some luck finding replacement parts like that by digging
through the servo spares box at the local RC model hobby shop.

Thanks but these are not normal pinion gears. They fit a socket on the
magnetized rotor with a specific shape. So, either an exact replacement
is needed or the entire rotor needs to be replaced.

Yes, possibly something could be modified, but that kind of defeats the
purpose of just being able to drop in a replacement for a 5 cent part.

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Sam Goldwasser wrote:
You know those tiny inserts in timers and clocks that crumble after time.
They are the plastic pinion gear that fits into the magnetic rotor of
the common Intermatic timing motors.
Does anyone have a source for just these pieces? I have several
appliances that are either inoperative or from which I've been
"borrowing" these pieces to fix others.
A typical motor part number is WG-1420-1.
Thanks.
--- sam