Motors come with switches and spindles. Each motor has its own unique spindle and, with only a few exceptions, the spindles from one motor are not interchangeable with any other motor. Most motors are "right hand" (RH). That means the shaft and spindle stick out from the right hand side of the motor. On the other hand (please excuse the pun), "visilapping motors" are all "left hand" (LH). Double spindle motors, of course, use both a right hand and a left hand spindle. Right hand and left hand spindles are not interchangeable. RPM 3450.