On 7/27/2017 8:40 PM, John B. Slocomb wrote:
On Thu, 27 Jul 2017 09:57:44 -0700, sms
wrote:

On 7/27/2017 7:08 AM, AMuzi wrote:

snip

In theory maybe but I've never seen that in real life. Rust is ugly but
in terms of % reduction of cross section of a spring, it's meaningless.

The spring is not rusty. But it pops out with no effort, it's just not
springy anymore. It seems to be fatigued.

The brake sets are cleaned and lubed. I may still order some springs to
use these brakes on another road bike which has lower quality brakes. If
I were in Wisconsin, I'm sure that AMuzi would have the springs in
stock, but the shops in Silicon Valley have little interest in stocking
and selling little parts like this.


Probably because no one but you ever wanted to buy any :-(

https://www.teachengineering.org/les...cancer_lesson2

"... structural materials that are able to safely endure
everyday stress while remaining in the elastic region of the
stress-strain curve, otherwise permanent deformation occurs..."

For single pivot bicycle brake springs, simply reshaping a
damaged spring by holding the center section in a vise and
moving the ends to a symmetric shape is straightforward and
simple.


--
Andrew Muzi
www.yellowjersey.org/
Open every day since 1 April, 1971