This was purchased some years ago but never used because we bought a rack to fasten on the back of our car. It has been stored in the attic and is "as new" apart from a superficial scratch on one leg. I no longer have the box, warranty or any instructions although it all looks very simple, to use, fastening to roof bars by means of 3 quick-release clamps. The arm holding the bike is lockable. At the moment I can only find one key but it should be easy to have a duplicate made if required and I shall also try to find the other key.
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