The holder has a cutout for receiving {TAIL ~ an arm} that is not being used, and which avoids contact with the outer border and {HEAD ~ each side} of that arm 
The holder has a cutout for receiving { TAIL ~ an arm } that is not being used , and which avoids contact with the outer border and { HEAD ~ each side } of that arm
OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH