Here are four additional terms you need to know. A “stop” is a mechanical means of limiting the rotation of the shaft to the desired number of positions. In a “fixed stop” switch, Grayhill installs the stops at the factory. In an “adjustable stop switch” the stops are supplied as separate parts. The customer then installs them in the desired positions. This type of switch is ideal for quick prototypes. A continuous rotation switch is a switch with no stops.