Rookie with a 4-speed question

So - I'm wrenchin' on a '74 Duster that's got a 4-speed in it. She's ROUGH - but hopefully not finished yet.

There's something wonky with my clutch; every time I fully depress the clutch pedal, it "sticks" all the way down. Not sure why - hoping that you'll have some suggestions.

I'm wondering if there's not an additional spring that's missing - can you tell from this photo?

[ame="http://s512.photobucket.com/user/cptmoney/media/Skitch_resized_zps80fcb836.png.html"]Skitch_resized_zps80fcb836.png Photo by cptmoney | Photobucket@@AMEPARAM@@http://i512.photobucket.com/albums/t326/cptmoney/Skitch_resized_zps80fcb836.p@@AMEPARAM@@512.photobucket.com/albums/t326/cptmoney/Skitch_resized_zps80fcb836.p[/ame]

See that highlighted silver thing? What is that? There's a spring-loaded clip looking sorta thing....is there supposed to be another spring on that guy?

Any ideas?

I'm grateful for all your input - one way of the other!