I have a strange problem. Both jambs are plumb, the sill is level but the sliding door does not close properly if I do not raise one of the rollers almost to the maximum. Funny thing is that this misalignment happens when the moving door is also set plumb. Geometrically this should not be possible.
One of the issues I am trying to solve is to keep the edges of the two doors, the fixed one and the sliding one when closed perfectly overlapped so achieve perfect insulation