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On Wed, 24 Dec 2008 14:16:11 GMT, (Restless) wrote:

About 50% of the time, the flapper seats properly after flushing. The
rest of the time, it does not, and it's necessary to tap the flush
handle.

Is this a flapper problem per se, or a problem with some other part of
the mechanism? Thanks

I assume that you have already put a new flapper on and 50%
success rate is what you have now. That is because all flappers are
not created equally. Many generic flappers that are used for repair
are cheap and being so their dimensions vary enough to cause this
type of problem. Try to get the OEM part or at least purchase a
higher grade universal flapper that may have better dimensions.