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I finally fixed mine. I tried Pam, Silicone rubber slide lube and the snapping it closed. The snapping it closed was not well accepted during the "wee" hours of the morning!" I totally disassembled the whole unit and found that the black shaft on pedal side of the unit (the shaft that is connected to the half round valve that closes the big hole) was over-sized. This shaft was such a tight fit and was binding and not allowing the valve to close unless it was snapped closed. After much cleaning I removed the two "O" rings and put the shaft in my drill and with a fine sand paper sanded the shaft to a smaller size. I lubed it liberally with Vaseline and now it works so very smooth and no leaks. DW is much happier and sleeps better too.
This was posted in Sept 09 under "Toilet stopper not stopping" along with many other solutions to the problem.
Now here it is July 2012 and still working without a hitch.
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