I'm having some problems with my clutch "friction point" dropping lower
over time.  I've bled the hydraulics and replaced both the master and
leaking slave clutch cylinders but the problem still remains.  I am now
wondering if I have worn or broken pressure plate diaphragm fingers.
When I replaced the pressure plate 40,000 miles ago there was some wear
on the tips (i.e. center) of the diaphragm fingers where it rubs the
throwout bearing.  I didn't replace the throwout bearing at this time
because it seemed to be in excellent shape and was only about 4 years old.

The clutch is still very smooth and solid in its holding power.  The
flywheel, guide sleeve, cross shaft and cross shaft bushings were
replaced with a quality parts 40K ago.  The cross shaft does not bind
and the spring that holds the throwout bearing to the cross shaft and
the spring that preloads the cross shaft are in good shape.  I doubt
that the clutch disc is worn very much.

Does anyone have any suggestions?

Has anyone had a clutch diaphragm with excessive wear, and if so, what
were the symptoms?  Did it fail completely or did you just get fed up
with the low clutch and took things apart to see what was wrong?  How
many miles did you have on the pressure plate when this happened.  What
caused this wear to be excessive?

Thanks for your help,
Ed