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Step 4: Positioning the Motor End of Operator CAUTION: To prevent damage to steel, aluminum, fiberglass or glass panel doors do not rest the opener of the door without using a 2” x 4” at least 12” long. Raise the motor end of the opener and support it so you can open the door to its fully open position. You may need help raising motor end if ladder is not high enough. Open the door and place a 2” x 4” piece of wood along the top section of the garage door. Rest the double rails on the 2” x 4”, a