{HEAD ~ An elastically engaged portion} 67a of the operating lever 67 is elastically and selectively engaged with {TAIL ~ the U shaped engaging bar} 62 of the base 1 
{ HEAD ~ An elastically engaged portion } 67a of the operating lever 67 is elastically and selectively engaged with { TAIL ~ the U shaped engaging bar } 62 of the base 1
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH REL REL OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH