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No, the opposite, it pulls twice the cable with half the force. Where before there was one length of cable being pulled out by the lever there are now two, so the net result is double cable pull. Hope you can make sense of my crap diagram... If we call the distance to the pulley at rest x, each stretch of cable increases from x to x + d so net increase of 2d. It definitely seems to pull twice the cable using the old Eyeball Gauge
It's a non-destructive modification, sort of, in that if it doesn't work it can still be used as a normal road pull lever.
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Hang on... wouldn't that double the tension or force able to be applied to the cable, but halve the cable pull? i.e. making the lever somewhat useless with V-Brakes?