Bob from SWISCO responded:
June 9, 2021
Hello there. The adjustment screw is normally located at the bottom; however, I believe in your case it's the top. The hole with the other screw inside should be the adjustment screw, since that screw sounds like it fastens directly to the roller housing, rather than the door frame. Note too that you actually want to adjust the rollers to the highest point to remove the sliding door, not the lowest. See the video below for further details, and let me know if you have any other questions. |