Trying to set up a roller cam on the rear but the springs look like they should be straight, not curving inward:



Theoretically, this could cause mud buildup around the tire, affecting braking in sloppy conditions (Not that I ride muddy trails any more). Just looks like the springs should more closely follow the profile of the arms, but if I flip the springs over in the perches then the spring return action works to push the pads into the rims... power assist brakes!

Also, should there be some sort of washer to help retain the springs in the spring perch? This view is as if you were looking at the brake from the frame side of the bike:

Any thoughts/advice?