Patio Door

I'm not sure what you will have to do. Could I see a few pictures of the window, specifically of where the adjusting screw would be? Thank you!

The adjusting screw should be a hole just below the frame screw. As a matter of fact, it looks like the 81-004 might be your roller, but I can't guarantee it.

Could I see a close up of the bottom edge of the door? Maybe I can see some clue as to what you may be able to do.

I'm assuming that the other side is the same; that is, there's no adjusting screw way there, either. It's hard to believe a door manufacturer would make a door without taking into consideration the possibility of leveling the door. If the door is level and sliding there's no problem leave it alone, but if not you are going to have to remove the door entirely to get to the roller assembly.

Regarding your rail cap, it looks like it's on backwards. The high side should have wool pile weatherstripping up against the sliding door. I believe this weatherstripping is our 58-099.

Great, glad you were able to get it out. The screw you're asking about is an adjusting screw, though. Before you order this roller in the future, I recommend that you send a photo of your old one so that we can confirm.