Additionally, use of a full bushing 66 for supporting the upper slide bar 20 in combination with {HEAD ~ two bearing members} of {TAIL ~ shorter length} mounted adjacent the opposite ends of the housing 34 for supporting 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 
Additionally , use of a full bushing 66 for supporting the upper slide bar 20 in combination with { HEAD ~ two bearing members } of { TAIL ~ shorter length } mounted adjacent the opposite ends of the housing 34 for supporting 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
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