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Liftmaster 5580 - no limits
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I'm struggling to set the limits for a Liftmaster 5580 - the door arm works fine and travels up and down the rail but does not stop at either end despite turning the plastic limit screws as directed in the instructions. One of the two screws is depressed within the unit which makes me wonder whether they are working. Is there any way of checking them or resetting them?
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