A thumb break strap or flap or other type of {HEAD ~ retainer} may be used in {TAIL ~ this embodiment} 
A thumb break strap or flap or other type of { HEAD ~ retainer } may be used in { TAIL ~ this embodiment }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL