70 Swinger over center clutch spring

The spring most definitely assists when pushing in the clutch just unhook the linkage from the pedal and push it in by hand just make sure you hold on to it bringing the pedal to the top is not it’s only function.
The reason the over center spring is removed when using a diaphragm plate is the
spring can overcome the lighter springs in the diaphragm plate and the pedal stays
to the floor when you release it under higher rpm’s the borg and beck plates have much stronger springs hence the reason the diaphragm has less pedal effort.