Doors – How to keep the storm door from dragging on the threshold

doorshinges

I have an aluminium double glazed door that has dropped slightly and is dragging in the lower corner opposite the hinges.

I can't see how to adjust these hinges. Under the black dust caps there is just a black plastic piece with a small round hole: no hex or screw. Is it possible to adjust these? If so, how? If not, how can I stop the door sticking?

aluminium flag hinge

flag hinge, inside

Update: the door frame is a single metal frame. The hinges each screw into a steel plate which is free to slide up and down inside the frame when the screws are loosened. The black plastic is just separate pieces of clip-on cover.
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Best Answer

As requested : Is the black plastic thing a block that the screws are in? You may be able to loosen all of them (not just 1 hinge) slide the door up and tighten them. Strut clamps work this way it would be that or adding a new shim under each pin as those may have worn.

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