Adusting Height of Siding Patio Doors?

macman

I'm trying to adjust the height of a sliding patio door. Over the years the door has dropped slightly and is now difficult to lock, as the alignment of lock to housing has moved.
There is a plastic plug on the door edge about an inch up from the base, removing this reveals two screws, one crosspoint and one traditional. Which one do I use to adjust the height, and which way do I turn it ( I think it should be clockwise to raise the door)?
There is no visible make or model on the door.

societys_child

I don't really know, but presumably one screw will be tight ( ie wont tighten clockwise any more) and one should turn relatively easily in either / both directions.
(The weight of the door will probably make it easier to lower than raise - try taking the weight off whilst experimenting)
I'd try the crosshead first, turning clockwise, to see if the door lifted

macman

Thanks, all adjusted now, I just tightened the traditional screw clockwise a little and the door no longer scrapes the runner now.