The runner 44 is accommodated at {TAIL ~ the fixing portion} 431, and is capable of up and down sliding movements at {HEAD ~ the fixing portion} 431 
The runner 44 is accommodated at { TAIL ~ the fixing portion } 431 , and is capable of up and down sliding movements at { HEAD ~ the fixing portion } 431
OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH