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Remove the lower clutch rod. Use something to hold the lever on the Z-bar (A big crecent wrench works well). Then disconnect the pedal rod at the Z-bar. You can now slowly ease the Z-bar back and remove the spring.
What I have done in the past (on other cars...not C1) to remove the heavy spring is to push the clutch pedal to the floor and temporarily hold it there (piece of wood or a friend with some leg power) and then insert thick washers into the coils. Probably 8-10....and may need some masking tape to keep them there. Then release the clutch pedal and pull it back. The spring cannot retract because of the washers in the coils, and should simply fall out.
Use a similar technique to re-install. Use floor jack to extend spring, insert washers, and let the spring recoil. Then install in the car and push clutch pedal to the floor. As the spring is stretched, the washers will fall out or can be easily removed. Then adjust the clutch and you're ready to go.
Loosen the bottom bolt on the spring bracket, while using a bar or wrench to hold the bracket, remove the top bolt and then allow the bracket to rotate which removes the tension on the spring. To install one, do this in reverse. It takes less than a minute to install/remove the spring using this method. No need to remove any rods or change the clutch adjustment.
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette
Slideshow: A Jaguar designer's personal project imagines what a modern front-engined Corvette might look like if Chevrolet revisited the golden age of the Stingray.