This type of garage door drive has a ceiling mounted system with a rail track and lift you maneuver using a chain belt or screw drive mechanism.
Mounting a garage door opener off center.
If the door is properly balanced you should be able to locate the operator anywhere but always perpendicular to the door.
To offset mount the opener arm to the door section.
If your door has extension springs the opener must be installed in the center of the door.
Go ahead and mount it off center and save yourself a headache.
Attach the straps to the power unit with the hardware provided.
As you said run perforated angle iron from the center stile to the next stile over.
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You can be off center with the opener provided the door has a torsion spring which it sounds like yours does if your door was extension spring the kind when the spring stretch along the horizontal track then it wouldn t work properly.
Use one piece as near to the top as you.
The opener can be installed within 4 feet to the left or right of the door center if there is a torsion spring or center bearing plate in the way of the header bracket or door bracket area.
Offset garage door opener guests.
Most units hang from angle irons and metal straps that have holes drilled in them at regular intervals.
Overhead opener drive types.
Bolt the angle irons to a rafter or rafters with lag screws.
You may need to duplicate this for an off center mount.
Attach the straps to the irons with hex head screws.
Can an opener be offset from the center maybe a couple of feet.
You can t solve you re problems with the same level of thinking that created the problems.