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One cause of wiper blade chatter is that the blade is not square to the windshield. When the blade wipes in one direction it chatters; when it wipes in the other direction it's smooth.
If your car does this, then rotate the wiper arm slightly so that you move the angle of the blade itself with respect to the windshield moved away from the direction of chatter. In other words, if movement from the driver's side to passenger side causes chatter, you need to rotate the bottom of the blade away from the passenger side. Looking down the arm from the top to the base, the rotation would be clockwise
Maybe this will help
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