This potentiometer is a stepping type and the working principle of some signal selection switches is similar.It is a jumping switching resistor. Different from for ALPS 27 sliding potentiometer.Please don't disassemble the potentiometer, you can easily rotate it by installing a knob.In order to ensure that the internal connection of the potentiometer is tight. Rotation requires a certain amount of force.Potentiometer specifications: A 50K round handlePotentiometer mounting hole diameter:9.8mmsize:30x55mmMaterial:Plastic + Metalcolour:Photo ColorPackage Contents:1 * Volume potentiometerOnly the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.