an adaptor member adapted to be fitted to the second supporting section and formed with {TAIL ~ a guide groove} for pinching {HEAD ~ the sub shaft}, and 
an adaptor member adapted to be fitted to the second supporting section and formed with { TAIL ~ a guide groove } for pinching { HEAD ~ the sub shaft } , and
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH