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heatsink
A computer ram or heatsink cut to fit would work well. That would provide the optimuim cooling efficency. I would lap(sand) the top of the motor starting with about 400 grit then gradually work your way up to a 2000grit paper, leaving no high or lowspots in the motors can top surface. Then I would sand the contact surface area of the heatsink the same.
I would use a thermal epoxy, a thermal epoxy like they use for CPU heatsinks, not a thermal paste, but the epoxy and i think Artic Silver makes an epoxy as well.
The stock heatsink sits tight but it is not a efficent transfer or dissapation.
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