When the switching means causes {TAIL ~ the motor} to spin, the disks free spin around {HEAD ~ the motor shaft} 
When the switching means causes { TAIL ~ the motor } to spin , the disks free spin around { HEAD ~ the motor shaft }
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD