manner by bolts the wheel assembly 24 shown in fig1 and 4 comprises an axle 44 a pair of wheels 45 and a pair of brackets 46 and 47 the axle 44 can readily be made by inserting a concrete anchor in each end of a length of 1 2 inch 12 7 mm conduit and using a bolt 1 2 inch 12 7 mm by 31 2 inches 89 mm long at each end through a wheel 45 and turned into the respective anchor the type of anchor that is readily available is an expandable plug having a threaded hole in which a 1 2 inch 12 7 mm bolt is turned to expand the plug tightly in the end of the conduit used for the axle 44 the brackets 46 and 47 secure the axle 44 to the supporting members 15 and 16 respectively and may each comprise a single piece of tubing that is flattened intermediate its ends the flattened portion is turned tightly somewhat more than a turn about the axle 44 near a respective end of the axle each end of each of the brackets is flattened and drilled to have a hole the same size as the holes through the cross members 20 and 23 and the.