Tim Wescott wrote:


Actually, I can easily design the piece so that the absolute height of
the holes can vary by 1/4 inch up or down -- it's just the relative
height that's important, so that a shaft stuck through them is more or
less level to the bottom.

OK, then you only need the two sides to bend the same way. If your
brake is working properly, that should happen with a pretty small
variation.

Jon