Remotes worked intermittently - then stopped on old garage door opener. Door works fine with wired remote button at kitchen door. Can I use a different receiver with its antenna?

I bought a half horse sears garage door opener but there is a beam in my garage running at right angles to the track and hanging down about eight inches. If the opener track was about six inches shorter it would clear the beam. Can the track and chain be shortened a bit?

I have two remotes for my garage door opener. When I synchronize one remote, the other one doesn't work. Then I synchronize the second one, then the first one doesn't work. How can I synchronize both of them?

Both my garage door openers will not operate the door unless they are right in front of it. New batteries in remote did not help. Anyone know what the problem could be?

I have one Sears garage door opener and one Overhead door opener. The Overhead remote will periodically will open the Sears door. I have reset both openers by pressing and holding the learn button for up to 60 seconds. I have unplugged the Sears, pressed the learn button on the Overheard...