Clutch pedal will not come back

It's not the over center spring....

People always say you need to remove it with a diaphragm pressure plate , then why does it work fine in my car?
My pedal comes all the back up w/ over center spring and centerforce dual friction and has about an 1 1/2 of travel before disengagement.

Make sure the fork adjustment rod is long enough to start, I have always had to lengthen it 1 1/4''

make sure the bushings are good in the z bar and that all is tight.
If the pressure plate is right and all is adjusted properly, the plate should force the pedal back up enough for the over center to take over and pull it up the rest of the way.