STOP Hubcap Walk
My 1966 HT had one wheel- hubcap that would always walk on me even when I changed hubcaps. I tried all the remedies from spot welding little ridges on wheel to silicone them on.
This really works and simple too. Just file new sharp tips on hub caps and if necessary bend them up with pliers.
Once filed the hubcap will bite onto the wheel. Its that simple.