Tip 8: Test The Reverse Mechanism

To test the reverse mechanism of your garage door, it is the safest to use a paper towel roll, because they are soft and they are not strong enough to hold up any door, not even a doggy door, and it is a good way to find any obstruction that does not offer a lot of resistance.  Just put the roll in the threshold of the garage door, and push the button to close it.  When it touches the roll, the mechanism should lift up again and the door should open.  As such, the paper towel roll should not be damaged, or at least not a lot.

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