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Actually, I'm a little sheepish that it took me a month to discover it.
I mentioned in my post above that the lockup on my knife was nice and
tight without any vertical or horizontal blade play but it never occurred to me
to check the lock itself. I've never seen this on any Spyderco before
but if I press down on the spine of the knife in the locked open position,
the lock will slide up the ramp and the knife will close.
I tried closing my Cat as mwong described and I'm happy to report mine didn't close like he reports his does. Sorry to hear about that, the Cat and Chicago are great knives.
-Tye