I put small coil springs under the right and left "arms" that control the deflector movement. The coils are wide on the bottom and smaller on top, so the spring can compress inside itself. Works great, not that the deflector does a whole lot of good anyway, IMO.

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1985 380SE Blue/Blue - 230,000 miles
2012 Subaru Forester 5-speed
2005 Toyota Sienna
2004 Chrysler Sebring convertible
1999 Toyota Tacoma