The design shown in FIG 12 also provides {HEAD ~ a parking position} wherein {TAIL ~ the output shaft} 3 is locked and prevented to rotate 
The design shown in FIG 12 also provides { HEAD ~ a parking position } wherein { TAIL ~ the output shaft } 3 is locked and prevented to rotate
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH