Hehe, no need to apologise! Funny thing was, cutting down a full-size Allen key was something I thought of, and I am sure I have done something similar with a past bike, but when I priced one up it seemed a lot of money to chop it up and throw most of it away. There's another trick somewhere involving 14mm nuts, but I am too thick to remember it.
Point is, the cut-down Allen key is mechanically a sound idea, just uneconomic when there is a cheaper alternative.
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