Beadlocks clamp and support the tire bead evenly all the way around the tire. One more tool to help make the car repeat.

Screws grab hold of the bead at only a few places. Work a slick tire for a while with screws and you will begin to see witness marks in the side wall from each screw. At least run 16 screws per side if you are using them.

If the results don't match the theory, change the theory.