Z-bar/Clutch Rod Problem Pictures

It's a diaphram type clutch...man why didn't anyone tell me I wasn't supposed to have the overcenter spring before I bought a new set of pedals with a spring and the pivot when I had everything I needed already...sonofa...
What's the reason behind not using the spring with the diaphram style clutch? Does it get adjusted any different?
Thanks alot...(I think..)
Jon