My Vacuity runs constantly, I have to jiggle the handle to get it to stop.

Directions:

1. Turn off water at the floor supply valve. (See figure 1.0)
2. Flush the toilet to remove the water from the tank.
3. Remove the vacuum jug. (See figure 1.1)
4. Detach the chain from the handle lever (see figure 1.2) and detach the flapper from the arms (see figure 1.3)
5. Place the flapper in hot water (not boiling) for approximately 15 minutes.
6. Using a mild soap solution, clean the plastic seating surface upon
   which the flapper was resting. (See figure 1.4) When finished the
   surface should be smooth to the touch.
7. Remove the flapper from the water.
8. Place
   the flapper (while hot) back on to the seating surface. Be sure to
   allow 1/4" of slack in the chain between the handle and the flapper.
9. Replace the vacuum jug.
10. Turn on the water. When the cold water contacts the hot flapper, it
    should form itself to the seating surface and provide for a
    satisfactory seal.

Click the images below for bigger versions:

Quick Fix Code: FW20004