First, you will connect each pot's stereo ground signals together.

Cut and splice five pieces of solid core wire. Each piece should be approximately 15 mm long.

Bend the wire into a U shape. Bend the spliced ends so that they are sticking out at a 90 degree angle from the U shape bend.

Insert the wire into the potentiometer's two ground pins.

Solder the wire to the potentiometer's two ground pins.

Repeat for the remaining four potentiometers.