{HEAD ~ The hook} is disengageable from the hook anchor only by sliding {TAIL ~ movement} transverse to vertical and through the channel opening 
{ HEAD ~ The hook } is disengageable from the hook anchor only by sliding { TAIL ~ movement } transverse to vertical and through the channel opening
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH