By chance I had my spare wheel off a couple of weeks ago, to have a bit of a clean-out in the recess areas. Sure enough, the cobra was wobbly (laterally). Just needed tightening the countersunk woodscrews, the heads of which pinch down on the two little routered-out slots, which also permits adjustment to "proper vertical". If I was designing it, I would find a way for some kind of positive location. It is so vulnerable though, in close proximity to the spare, that maybe a bit of knock-ability isn't a bad thing.
