Ours are free standing. We did it by getting some roof corner plates at Home Depot. The are shaped like a small baseball home plate and made of steel. Then I welded about three feet of 1/4" rebar to the plates and ran the rebar through the bottom of the shoes, up through the legs, and into the styrofoam that makes the chests of the figures. I also replaced the wire in the arms because it's pretty weak. The last thing was to stuff the arms and legs with plastic grocery bags to fleash them out.
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