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Are you sure it's screwed? I was 5 miles from home once when my nds crank arm came loose. Had to use 2 alankeys side by side to tighten as I didn't have one big enough but couldn't get enough torque on it. Had to re-tighten every quarter mile or so but carried on regardless (desire to get home > cost).
Anyway, tightened up properly when I got home and never had another issue with them.
Thanks for the advice. I think I'll risk a postal return (worst case I have to pay postage), and if that fails probably replace it. Costly mistake but one I won't forget. Cheers.