{HEAD ~ The motor} moves a disk drive pusher in a first direction to rotate the sensor pack, and then moves the disk drive pusher in a second direction to eject a sensor from {TAIL ~ the sensor cavity} and through the sensor opening 
{ HEAD ~ The motor } moves a disk drive pusher in a first direction to rotate the sensor pack , and then moves the disk drive pusher in a second direction to eject a sensor from { TAIL ~ the sensor cavity } and through the sensor opening
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH