I would think that going 'digital' would better serve the motor and
avoid the heat.

e.g.:

http://www.electronickits.com/kit/complete/motor/ck1400.htm

http://www.circuitspecialists.com/prod.itml/icOid/3349

Please, if anyone can convince me otherwise, I'll do that when my
switch burns out again for the 3rd time.
        The switches must vary in quality. The price certainly does.
$15.00 - $45.00 CDN. depending on if it is OEM or made in 'gosh knows
where'

                                David (dsl82westy)