That big spring mounts from the dash side of the big pedal bracket to the clutch pedal, and works over center. Pulls the pedal up, then goes over center to assist holding it down. I’d look at the linkage from the pedal to the spring to see if something failed.
The other thing you might check is the bearing on the engine side of the clutch shaft or z bar. It’s a split bronze bushing that locates the ball on the end of the shaft. I’ve have loose or off center motor mounts cause 1/2 of it to fall out which makes the linkage really sloppy.
https://www.larrystbird.com/product/...on-2-required/