40 of fig4 steel yoke 6 is press fitted into steel yoke tube 7 support block 8 has a groove for holding a steel retaining ring 50 which prevents the spring housing tube 51 from moving down the spring housing tube 51 has a swaged flared end 53 so as to rest on retainer ring 50 vertical frame tube 12 and support block 8 are welded together at point 56 thus carrying the load of both the packs and the stress of the wheel vertical frame tube 12 provides a shoulder 52 which supports the stress transmitted by the wheel to yoke 6 yoke tube 7 spring 54 spring housing tube 51 and flared end 53 the spring housing tube 51 is swaged to a smaller diameter at its upper terminal 55 to form a load bearing surface for the spring 54 to compress against vertical frame tube 12 is welded to the central spacer bar 14 which is welded to the horizontal frame tubes 15 see fig1 when the cart 1 is disassembled it consists of two major components namely the handles 17 18 and the main frame of the cart no further disassembly is normally required for transporting or storing the cart because the cart in this condition is compact and easy to handle by one person all clamping screws 19 and spreader screws 25 are of the socket head cap screw type so that a single size lightweight hex key wrench is the only tool needed to tighten or loosen them in preparing.