Within a month all four center caps came off and were lost, but were replaced by the dealer. Now, some 10 months later the front two have shown up missing. Looks like I'll be ordering replacements and spares for the future for my soon to be collector vehicle. Any ideas on how to secure these caps so they don't come off except when I want? How about a locktite product, the one that is applied to bolts where they can be removed?