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The gripping force of magnets drops off too fast with separation distance. Every time I passed a semi, the blast of wind would suck my hubcaps off. Perhaps if I were to glue magnets to both wheel and hubcap, they would resist being pulled apart.
I've not been on in a while, since I gave the old Nissan to my grandson. My newer one is automatic transmission, and is much harder to hypermile successfully than the five speed tranny was...
A note to ebacherville on expanding foam- I did exactly that to repair a trumpet case. Fill holes with foam. (Actually I made my own heavy duty foam by stirring water into Gorilla Glue- it foams up nicely and ends up stronger and denser than canned foams) Just used Bondo to surface fill the expanding foam, and it gives a really easy to paint surface.
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