Im not sure if potentiometers are actually screwed into the circuit board. Normally potentiometers are self contained and click into place then soldered onto the circuit board. Usually the only way to get rid of wobbly knob is to replace it. You see the acutal wobbling is from within the potentiometer itself...not its connection to the circuit board. But to be honest I wouldnt worry about it....all potentiometers are designed to have a bit of give...some more than others. (hence lateral movement sometimes). The important thing is that the knob is securely attached...lateral movement does not denote a problem...its a matter of taste. EVERY synth (new and old) always had/has one or two knowbs that were wobbly. The exception being with the Nord 3 when a knob physically came off in my hand (just so happens I was trying to think of ways to get a refund hehehe)....
DS
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