The balance rail the the rail that runs underneath the centre of the key-bed. It holds each key in resting position via a pin. When a key is pressed it will pivot on the balance rail, pushing the rear of the key up to engage the action mechanism. Therefore acting as a fulcrum point. On the balance rail are felt bushings which are used to mute clicking and knocking of the keys against the rail. The height of each key can be adjusted by inserting paper punchings/shims on the balance rail pin, which is important for even key regulation, and makes the line of keys look even. Rhodes and Wurlitzer pianos, along with acoustic pianos, have a balance rail. On the Hohner Clavinet, the key pivots around a different type of system, more similar to an electric keyboard.