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