My Guardian is running at 57 Hertz (UNLOADED). From the manual I think this is a bit low so I would like to adjust it up a to at least 60 Hertz. Looking at section 2.8.2, it looks like the pot for voltage adjustment is really an adjustment to the engine RPM and thus the frequency. So if I dig into machine this adjustmet is my frequency adjustment. Is this correct? If so is there instructions on how to get to that Voltage Adjustment Pot.? Thanks Al al@soboleski.us