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Praksy if the shaft was short the piston would pop out of the cylinder
going by what you have said you may have a broken diaphragm in the pressure plate
You haven't stated if the clutch slips or not or if the clutch has been replaced.
Normally if the clutch is just warn out it will release right at the top of the pedal travel
if it has a broken diaphragm the pedal will feel soft then frim and release ta the bottom of the pedal travel
Also if its broken the diaphragm if you give it a bit of stick it will slip