It is possible to screw either cup in either side. They are left and right
hand threads. The fixed cup is a bit loose. I think that the bracket shell
threads are worn sufficiently to allow this to happen. I suspect that an
amateur has re-assembled it wrong way round and it has taken just enough off
the already slightly oversized bracket. It is not a bracket that I would
trust to a long service life. I will reassemble it in proper order with some
Loctite and ride it seldom and locally armed with a suitable set of tools.
Link to new photos
http://www.flickr.com/
Mark Stevens Evanton Scotland