I've got fairly cheap traditional cantilever brakes on my bike. The front one is currently awkward to set up as the left arm sits considerably further away from the rim than the right when released. As a result, I have to set up the brake so the pad is almost all the way in on the left arm, and all the way out on the right.
Normally you'd adjust the centering with the screw on one side, but, being cheap brakes, said screw is lacking from mine. Is there any way to adjust them other than dismantling the brakes and physically bending the springs?