Are you riding on modern radial tires, or original-style bias ply tires? Radial tires twist and flex the steel wheels much more than the rigid bias-ply tires that were standard issue in the 60's. As a result, radials tend to throw hubcaps. Maybe someone who's welded small "tabs" onto the outer edge (or rim) of their wheels can reply with some "how-to" instructions. Have heard of other Tbird owners who've solved this problem by rigging up such "tabs". Good luck.