[r-t] Double Helix

Philip Saddleton pabs at cantab.net
Tue Aug 23 16:49:13 UTC 2011

Philip Earis said  on 23/08/2011 15:48:
> "I'm not sure this will work - the 1458 lead end changes the parity..."
> But can't you counter-act this with an appropriate choice of half-lead change?

Not if you want a 1-3-4 differential.

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