This type of foil will have a spacer or sleeve between each section and there will be one or two screws above and below the join going through the extrusion into the spacer. You can see these screws in your
photo, but they do not look tight and in fact might not even be the correct screws.
It appears that the two sections are not aligned which they would be if the spacer is in place, undamaged, and the screws are tight. So I presume that the spacer is not correct or for some reason unable to properly secure the two sections. I also see indications of
corrosion on the foil near the joint, another indication of a problem inside the joint.
The spacers must pass the torsion applied at the drum up the foil to the next section, and so on. A loose spacer or joint may not do that, particularly in heavy
wind conditions. Further the upper swivel must slide past the joint, and the loose screws and mis-alignment will probably prevent that.
You need to disassemble this joint and inspect the spacer and screw holes in it. It may be possible to re-assemble it and tighten it, or possibly replace the screws with one size larger (after tapping the holes in the spacer). However, if the foil sections are damaged or the spacer missing you are probably going to need some new
parts.
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