Use this simple, but effective LavaCart R12 Anti-Wobble Tensioner Set to help remove wobble from the folding side above the swiveling Casters. Install both tensioners and once the rail is raised and perpendicular to the cart bed, tighten down the screws with a screwdriver (not included). The two low-carbon steel bolts per each tensioner and mounting plate can remain attached to your cart, merely loosen the bolts when it is time to fold up your cart, and off you go. You only need one set of tensioners per cart.
UPC: 850066387184