This is common with the Mk2 chassis cabs, I would have thought that Ford would have sorted it out by now. If it won't tighten up, try gumming it up with superglue. It's an art though, don't put too much on! I once returned from Paris to find Gary had tried to shove the best part of a tube of supercglue at one of the mirror arms, in the rain. It ran down the door, and when the wet gets to superglue it goes white. So it looked like a 2ft streak of permanant bird sh*t. Stayed there till we had a respray.....
