Hi everyone, I hope someone can please help me?

My Punto has failed its mot because the drivers seat is wobbly, I took it out yeaterday and noticed that some screws were missing from the mechanism that adjusts the height of the seat so I replaced them, but it didn't solve the wobble problem totally :bang:

I cant see why it is wobbling at all - the side of the chair nearest the drivers door is fine - its just the other side. The frame doesn't seem to hold together very well but I cant see anything obvious that would cause it.

Has anyone got any ideas what this could be or even got a picture of a subframe so that I can compare it to see if anything it missing from mine?

Any help would really be appreciated as the re-test is tomorrow!