A pivoting ball support is rotated and displaced as {HEAD ~ the ball} enters the device, and is returned to a position whereby the ball is prevented from exiting {TAIL ~ the device} 
A pivoting ball support is rotated and displaced as { HEAD ~ the ball } enters the device , and is returned to a position whereby the ball is prevented from exiting { TAIL ~ the device }
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL