I always thot the plastic thumb screws were a cheap choice for a 75k car. They hold the removable portion of the front splash guards, 6 on each side. I recently tried to remove them and was sure they were going to snap. Plus the 1" base conforms to the slots in the part that's over the headlight housing making them even harder to get out. They eventually all came out ok, but a hassle. So.........I went to Tractor Supply and got 12, 1/4 x 20 x 1" body bolts and replaced them all (saving them, of course, for the next guy). Made some spacers as shown to protect the fiberglass. Now easy to get out and looks 100% better. Little details and probably gained 2 or 3 horsepower. PS...... Thot I should add: just because you have bolts now don't crank down on 'em, you're still working with 20 year old fiberglass. Use some blue Loctite if you're worried about them working loose.