Remote Control airplane balancer

Great Planes no longer makes the Airplane balancer, so I designed a 3d printable version. Mine is bigger, allowing for larger airplanes to be balanced. I added shoulder bolts to my design to allow rubber bands to be used to hold the balance arms in place while placing the airplane on the tool. This was always an issue while putting a plane on the great planes balancer. I added the part on the trailing edge of the ruler to protect the wing from being damaged by the metal ruler. I plan to make sev