Ultrex Power Dial

On the foot control, my wheel for the power settings has almost zero resistance and needs to be tightened up. I can be on a spot fishing and have it set to 4 and then run across the lake and when I get there and lower the TM, its on 10 and it gets "sporty", LOL

Anyone know if this is an easy adjustment? I first noticed it after I had repair center (dealer) work on it.
Wanted to see if this was something I could do without messing up anything else under the pedal

There is supposed to be a friction spring on the knob shaft to prevent that.
Part # 2292700

https://motors.johnsonoutdoors.com/PartStream/Parts.aspx#/Johnson_Outdoors/Ultrex_80_or_112%2c_24_or_36_Volt%2c_45-60_inch_Shaft%2c_2297160_-_2017%2c2018/Foot_Pedal/Ultrex_80_or_112%2c_24_or_36_Volt%2c_45-60_inch_Shaft%2c_2297160_-_2017%2c2018/Ultrex_80_or_112%2c_24_or_36_Volt%2c_45-60_inch_Shaft%2c_2297160_-_2017%2c2018_Foot_Pedal

Thanks Wayne