ThroughMount Slotted Switch Mount switch through 5/8" hole in bulkhead or airframe.
Switch is SPDT so choose your own hookup method.
Originally used as a 120 / 240 voltage selector switch this unit is very clean and mounts almost flush. You can scratch off the lettering and make the switch read 0 and 1 to indicate on and off as shown here. Photo courtesy of Tim Kurreck.