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“BRIAN MARSHALL”]It’s the rising pulley that halves the applied braking effort. A force of say 40 pounds pulling the pulley up in its slot applies 20 pounds to each brake. But the same force applied to the ‘wiffle tree’ type twin-pull lever goes to both brakes.

Hmmm. The pulley is there to ensure both cables have the same equal force applied, but other than that, it’s the same principle as as the centre-pull brakes on my old pushbike, ie, one single cable pulling two to pull on the brakes. Nothing’s for nothing in engineering, and division of the applied force (at the handlebar lever) must happen however the initial pull is achieved.
Think I’ll have to sleep on this one and let the old brain box work… 😉