Norm Nelson has come in third and even second in the grueling Cannonball Motorcycle Endurance Run across America, both times on 1920s-vintage BMW motorcycles. But as the St. Augustine man saddles up at 8:45 a.m. Saturday in Atlantic City, N.J., for his third Cannonball, he said he hopes his newest — and oldest iron steed — will bring him to Carlsbad, Calif., on Sept.