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
Motor Stepless Variable Speed Control Controller Switch 12V 24V Max 20A PWM DC #
PWM speed control module for model trains 0-12v WITH Reversing Switch Attached.
