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