The spindle easily accepts a nicer knob than the one supplied.
WINGONEER DC Motor Speed Control Controller 3V-35V 5A PWM Controller Stepless DC 3V 6V 12V 24V 35V Variable Voltage Regulator Regulator
12v PWM Speed Control Module. 2 amp. DC Device. Screw Connections. Fast Delivery
12V 24V Max 20A PWM DC Motor Stepless Variable Speed Control Controller Switch
6V 12V 24V 35V PWM DC Motor Speed Regulator 5A 90W Control Switch Module
Motor Stepless Variable Speed Control Controller Switch 12V 24V Max 20A PWM DC #
