On 2011-06-14, Fat-Dumb and Happy wrote:

wouldn't, of course, so I wound up tying it around the arm.... I'm so
used to holding down on the handle I never thought to just try flushing
it after installing it.

The difference between cheapo flappers and good one's. Good ones have
an air space on the underside of the flapper. When flushed, the air
space causes the flapper to float upward until the water in the tank
is completely gone and the flapper again drops down and seals shut.
Not exactly rocket science.

nb