To have high/off/low you need a 3 position switch. Something similar to this. You’ll need to measure the opening to see what will fit or modify accordingly.Is there a version of this switch that has high and low functions? I'm trying to use this switch for a set I got from Diode Dynamics that offers high and low options. Thanks.
WR13ATN NKK Switches | Switches | DigiKey - https://www.digikey.com/en/products/detail/nkk-switches/WR13ATN/2107124