Diaphram Clutch, What spring?

It is a good idea to have a light spring on it. Without a spring the weight of the pedal will always sit on the linkage, and consequently the throw out bearing will always be in contact with the clutch fingers and spinning, causing an early failure of the throw out bearing. I used a modified jack hold down spring from the trunk. It worked great.

Same reason you should never ride the clutch or drive along with your foot resting on the pedal, and also why the original over centers....it pulls up at the top, and down at the bottom.