The shaft is drivingly coupled to {TAIL ~ the movable switch elements} and {HEAD ~ the detent mechanism} 
The shaft is drivingly coupled to { TAIL ~ the movable switch elements } and { HEAD ~ the detent mechanism }
OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD