I washed the windshield thoroughly before using this mount, I even wiped the glass and suction cup with alcohol prior to installation. In warm/hot weather, only the weight of the mount caused the device to slide off the windshield. RAM needs to redesign this device to move the bowl farther back so the vacuum is strong enough to support the mount, short arm, and phone holder. I have used RAM products for many years and they are in all of my personal vehicles as well as in the specs for all of the police department patrol cars I resigned from. I have never been disappointed with a RAM product. It's been over thirty days so I can't return it. Now that the weather has cooled down, maybe this will work out in the fall and winter. One can only hope.
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