I just tried to install a pair of rear cantilever brake pads for over three hours and failed.
My problem is that my brakes don't pull the pads straight in from the sides. They pull with a sort of off-center curving or rocking motion, so the front tip of the pad has a lot more travel to it than the back tip of the pad. Because of this, I have to position them so the backs of the pads are much closer to the rim than the fronts. These are Kool Stop Eagle 2 pads, which have a little lip thing that juts out a little bit at the rear part of the pad. They look like this:
That lip makes it so I have to put the pads at a sharper angle, which means the front tips of the brake pads are very far from the rim when the brakes are resting. It takes so much cable slack to allow for that big angle that I basically have no rear braking power.
Here's a 12-second video that shows what I'm talking about.
I've tried to adjust this a zillion different ways but I can't get it working. If I change the angle of the pads so that the fronts aren't so far from the rim when the brakes are resting, the rocking motion makes the pads strike the rim unevenly. If I tighten the slack even just a little bit to give myself some more braking power, the lip at the back end is constantly rubbing against the rim.
So I guess what I want to know is... does any of this information make sense? Is there a way I can go about solving this? And, are all cantilever brakes like this, or are there better ones that pull straight?