To remove either of the three control knobs on the control assembly, grasp
and pull rearward.
NOTE: Do not pry the knob off its potentiometer shaft as damage to the surface
of the control assembly bezel may result.
If the D-shaped spring clip which sits inside back end of knob remains on
potentiometer shaft when knob is pulled off, remove it with needlenose pliers
and install in knob.
To install knob, align its keyed surface with mating surface on
potentiometer shaft. Press knob forward until fully seated in control assembly.