• Thanks for those links.

    I'm not yet bored of the nut-and-bar method, but it looks like I'll have to buy a longer threaded bar and grow some bollocks in order to spread the frame far enough (I fear for the brake bridge).

    However, therein lies a problem, as I've tried to illustrate below. Obviously the further you spread the frame, the bigger this problem becomes. And the tension in the frame is always trying to force the bar backwards out of the dropouts. How do I avoid this? Can I buy some kind of triangular nuts?

    Once the frame has been spread far enough, presumably I'll then have to bend the dropouts a little bit so that they continue to face each other.

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