Additionally, use of a full bushing 66 for supporting the upper slide bar 20 in combination with two bearing members of shorter length mounted adjacent the opposite ends of {HEAD ~ the housing} 34 for supporting {TAIL ~ the lower slide bars} 22, 24, allow the benefits of the present invention to be readily realized without increasing the materials costs of the bearing members 
for supporting
Additionally , use of a full bushing 66 for supporting the upper slide bar 20 in combination with two bearing members of shorter length mounted adjacent the opposite ends of { HEAD ~ the housing } 34 for supporting { TAIL ~ the lower slide bars } 22 , 24 , allow the benefits of the present invention to be readily realized without increasing the materials costs of the bearing members
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH