I have been waiting patiently for my owners manual to come so I could find out what this knob does. I just found out it will be another week before it gets here. Can anyone help me out? It is located below the seat to the left of the knob that I think regulates the speed of the 3PH drop. There is an arrow above it and it has the numbers 0.0, 0.5, 1.0,......3.5, 4.0, and the word TOP on it.
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