This person's channel was hosted on Vidme, which is no longer in operation. However, you might still be able to find them at these links:
With the door fully open, lay a piece of wood such as a section of a 2 x 4 on the floor in the center of the garage door opening where the door would touch the floor. Push your garage door opener’s transmitter or wall button to close the door.
February 2 2017
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