Terry the open Stop directs the wind towards your body. 90 degress open should direct wind to the driver and angle it in somehwhat. If the Open stop isn't there the deflector will rotate too far and reduce air flow.
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I finally had a chance to try out the Baker wings. Long story short, I love them. Everything worked as advertised. No vibrations at speed on the highway. Just a great product. Two thumbs up! :biggthumpup::biggthumpup: