Is there a difference between this throttle http://www.thesuperkids.com/curriethrottle.html and a 5k ohm potentiometer from ebay? The throttle is 40$ but a potentiometer is much cheaper on ebay. It's for a bldc motor with a built in speed controller that requires a 5k ohm potentiometer. I'm not sure if the potentiometer would work for my purpose since the motor is 24v 400w and the controller is presumably with with built in current limit of 30 amps.