The door on my two car garage are at least that old and have no sensors as well. The door is solid wood and heavy as heck. I don't know what pressure my motor is set at. It penned the cat to the floor and didn't reverse. The cat some how survived that ordeal but I've noticed he stays away from the door now when it is going up or down. I too have been meaning to replace the door with an insulated clad door with the sensors. The sensors are a great precaution.
As you slide down the banister of life, may the splinters never point the wrong way...
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