The Scimitar box had a button on it you had to press to engage O/D so you would have 1st, 1 1/2 (O/D), 2nd, 2 1/2 (O/D) and so on up the box. If you've seen Mark Evans An MG is Born on Discovery he fitted a similar box to the MG B he built and he actually went to the place where the boxes are made/reconditioned.
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