a mounting structure for mounting a device to an electric motor having an output shaft , the mounting structure comprising : a body including an opening for receiving the output shaft through the body , a plurality of connector elements supported by the body ; and a plurality of threaded inserts , each of said inserts being inserted in one of said plurality of connector elements for receiving a fastener to connect the body to the motor ; wherein each connector element is sized and shaped for alternatively receiving an insert in at least two , non - coincident locations within the connector element .