Hey, I'm fixing an old teknetics 1-d/505 metal detector for a friend. The "click on" part of the potentiometer only works very intermittently and needs to be replaced. The problem is that it has 5 legs (looks like 6 with two bonded from the factory, a middle and side one) and two of the pins don't do anything from what I can tell. There are traces on the pcb for them. The other three are like a normal pot, with the mysterious two underneath. Also there are two of these pots in the device and they're identical. Anyone have any ideas as to what these inert yet connected legs are for?