Separate part number for 22mm Potentiometer.
Harmony Push Button
Potentiometers are customer supplied.
They can be purchased at an electronics supply house. The operators are for potentiometers with a standard shaft length of 44 to 50 mm, and for the ZB4BD912 a shaft diameter of 6mm and for the ZB4BD922 a shaft diameter of 6.35mm.
Another option is to get the complete assembly (Operator + Potentiometer) Please see below for products part numbers.
+/- 10% linear mode precision complete potentiometer with screw terminals.