reciprocating means for the support apparatus 10 the perforated tube 28 has the stop bolt 36 that prevents the perforated tube from being accidentally removed from the support apparatus 10 the support apparatus 10 functions to accommodate a variety of dimensions of vehicle components in the following manner as the perforated tube 28 is extended or retracted from a center of the support apparatus 10 represented by the base weldment 12 the sprocket teeth 62 engages the perforations 34 of the perforated tubes 28 respectively when perforated tube 28 is pulled outwardly away extended from the base weldment 12 the sprocket 60 turns in a clockwise manner this clockwise motion acts to displace the other perforated tube in an equal and opposite direction when the user wishes to shorten the support apparatus 10 the user may push the perforated tube 28 inwardly toward the base weldment 12 and the sprocket 60 then turns in a counter clockwise manner this motion serves to also translate the other perforated tube 28 inwardly and equally towards the base weldment 12 and thereby shortening the length of the support apparatus 10 thus the sprocket 60 allows for the reciprocating action of the support apparatus 10 this reciprocating action allows for more precise adjustments of the various pieces.