Dave Sr. from SWISCO responded:
August 6, 2021
I'm not sure myself what to suggest. Take a look at the other roller and adjustment screws in the door to see what their setup is. It is possible that all you need to do is to install a screw into that threaded sector at the bottom of the door that you show in your photo. I also recommend that you take the screw to a local hardware store to match it up. |