if you contact your local steel stockist, you can buy steel rod (4mm thick) in 3m lengths in most thicknesses...then buy heavy duty electrical connectors, all you need is a hacksaw and a file, cut two short pieces ..bend them to spike the wings and connect them to the steel rod using the electrical connectors...
jobs a gooden.....if you want to make it even better, cut a piece of steel tube....8 or so inches and put that in the ground first then put the bouncer/floater into the steel tube, ...if there is wind it will constantly turn into the wind , giving extra movement
if you have a c