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