Umm...

Whats the difference between applying enough force by hand over the tail
spar to raise the nose (by pivoting on the main gear) and using enough
force in flight to push the tail down? How is one more likely to cause
cracks than the other?

Dave

Dan Thomas wrote:

The gaskets we use on that pump are a black composition material; very
strong and solid. Haven't seen cork in a long time, and never a rubber
gasket.
I agree that any cork gasket there should be replaced with a new
composition gasket.
As far as ADs that aren't, there's another one that should be: the
horizontal stabilizer forward spar centre section cracks and could
fail. Cessna has a service bulletin on it, but sooner or later someone
will die because it wasn't mandated. Those who push down on their
stabs to turn the airplane are almost certainly going to have cracked
stab spars.
Dan