Trying to control a dimmer/fan switch with Mindstorms EV3

[38034580]

I have several of these switches kathy ireland HOME Dual Slide Ceiling Fan and Light Control, White - Ceiling Fan Wall Controls - Amazon.com on my wall. I'm trying to mount a tank tread mechanism next to the handles so the grooves can pull them up/down to control the light brightness/fan speed. Two motors will be used for fan speed and light brightness. However, the tank tread doesn't always grip the slider. What do you suggest?

[Thomas4]

The easiest thing to try is to shorten the tread. This will then cause the tension gained to better hold the tread firmer against the knobs.

 

Or you could glue a rubber grommet on the knobs to give the tread a better surface to grip to.  Her, I would try it prior to permanent attachment. Or if the interior hole is small enough to grip onto the knob, no type of adhesive will be necessary.