Bob from SWISCO responded:
September 3, 2020
The track slider that works with our 39-253LB is the 39-529. It's possible you might be able to get the replacement operator to works by replacing the track slider. However, I should stress that the 39-253LB is often confused with another operator, the 39-438B. These two are practically the same, except that the 39-438B has a built in track slider that is more rectangular in shape. This is not interchangeable with the 39-253LB and 39-529. Now, based on your photos your old track slide does look more like the 39-529. But review the video below just to be certain. |