I had a few Armtubes (minimum 6). None had the problem you described.
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For your own peace of mind it might be worth checking the geometry i.e. linearity of the arm with a straight edge or steel rule, at both the top and side to see if the thinner portion of the armtube is on axis? Someone may have stressed it accidentally?
Certainly the arm can present itself as something of an optical illusion at times whereby imagination can lead you to think it is bent or twisted when it is not. Hopefully not!
Thanks for the replies. I did in the end hear from Bob Graham, as well as having a useful exchange with the UK distributor. According to the latter, this is a known fault with early versions of the mark 1 armwand, as a result of the jig being not correctly set up. Whether the devious owner of the arm was aware of this is not clear!