Originally Posted by
pstake
It's off and the spring assembly is still attached ... I got a set of arch rivals but the pin the gives the spring purchase, that goes through the frame next to the bosses (the three holes) — that pin is gone from both sides of the brakes. So I wanted to try and take the assembly apart, and the assembly from a donor set ... or at least the pertinent parts, if possible.
Does that make sense?
As I said not all brakes do it exactly the same way. From your description, I suspect that your brakes use a spring stop cam behind the arms. This usually goes through the aluminum arm all the way to the front. But it's a slip fit and you should be able to push it out.