Giant upside down square sheet sander? Mmmmm... I like the sounds of that. Sounds like you are looking to make rubber torsion(?) Mounts? What about flexible (rubber) fuel line pieces clamped to opposing pins. The distance or space between the pins may be critical but would give a simple flexible "joint" for movement in two directions. Some other type of hose may work better, something like the silicone tubing used in coffee makers to join the plastic pipe to the aluminum pipe in the burner. There is an answer out there somewhere