I removed and replaced my rear sight, and I guess the springboard that keeps it tight lost its spring in the process.  Ever since, the rear sight has been loose––it flips up when tilted upside-down, and there's some play from side to side.  I've tried rebending the spring for a while, but it didn't help.  Is there a way to tighten the spring, or replace it without tearing apart the entire rifle?  Anybody else have this problem?

How did you remove the rear sight and install the new one?

Did you do something like what's in this manual: http://www.box.net/shared/cu2djae1zb

If the sight is floppy it's wrong. It's possible the rear sight isn't seated all the way. Otherwise,  the sight, sight block, or spring needs to be replaced.

Can you take any pics detailing the rear sight?

BSW

I used a Campy sight tool and put the same sight back in (just had to switch around the elevation slide).  You can't see anything unusual by looking at it, but here's a quick video showing what happens when you wiggle it:

http://www.youtube.com/watch?v=9_kzEzD001s

The rear sight looks like it's installed correctly.

Does the spring under the sight touch the underside of the sight?

I'm suspecting your sight spring is bent. BSW

did you push the site spring all the way back into place?