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