What control is this on the PCB board?

[scobod22]

I have an Action Claw skill crane and was curious what the dial is on my pcb. The claw strength is adjusted at the claw and the closest thing I can find to a manual is for a Betson Big Choice in which the board is far from similar so I can not do the research myself. Hoping someone can shine some light. This board is from another action claw from another forum. My board has a knob on the top of the dial but all else is identical.

[sandheaver]

given the board it is on, i'd say it's the movement speed adjustment.

looks, though, like the middle connector isn't connected, but that could be the pic playing tricks on me.  if it's not, it's just there to act as a normal resistor and changing the dial won't have any effect.