The pilot stated that the airplane was tied down on the right side, and the right main landing gear wheel was chocked. After hand-propping the engine, the airplane's tie-down rope "came loose," and the airplane "veered" into an adjacent hangar. The right wing sustained substantial damage. The pilot stated that the accident could have been prevented by "using a better quality tie-down rope, having a second pilot in the airplane holding the brakes, or by having both wheels chocked instead of just one."