I've had Ballard Electric rewind thruster and winch motors with limited positive results.
They increase sindings with thinner wire that results in a 10 to 15% increase in power.
The motors run a little warmer after rewind so duty cycle is reduced.
The winch motor had a noticeable increase in retrieval speed, not as much with the thruster.
I don't remember the cost, but I didn't think the results were worth the cost at the time.
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