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