Clegg, you have got the L plates freely moving on their pivots, and you have got the 10-32 screw in to make that adjustment? Sorry to call your building talents into question, but we had this problem here, and that's what it turned out to be. Once we got the screws in and adjusted, it went away.
My other suggestion (which just says your driving is bad!! Sorry again!!) is that the pod is twisted. I have had the two pod plates twist, and be held in that position by the cross brace. Release one of the screws in the cross brace, re-tighten, and the problem goes.
Hope that helps, if you're not mad at me!!
