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