How can I keep the toilet flap from dropping immediately after the handle is released? The handle must be held down for flush to occur.

Hi Bart:

Start by adjusting the chain so it only has about 1/4" play or jiggle in the flush handle...don't make too tight..which is tempting, but will cause issues for you..I promise. Go for 1/4" jiggle or so in chain... get back to us... MARK

Sounds like your flapper linkage needs adjusting.
With the flapper seated the linkage wants to have 1/4" of play. Too much play and the flapper doesn't get pulled back enough giving you a short flush. Too tight and it lets water seep past the flapper. I adjust the chain by the link and if it needs fine tuning, I bend the flush lever rod a bit untill I have the desired play in the linkage. One more thing about a flapper. you will see where the old flapper hooks onto the base of the white overflow tube. On a older type with no hooks the flapper has a ring that slips down over the overflow tube to the seat. If your tank has hooks, take a sharp knife or scissors and cut the neoprene ring off on the marks provided and hook the flapper on the hooks. Leaving the ring on will interfere with the flush. The water level in your tank should be 3/8 to 1/2" below the top of the overflow tube when the tank's filled. And the little tube wants to run from the ballcock and connect to the white overflow tube.. good luck, Tom

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My problem with the toilet flap is solved. I had the linkage right, but I didn't know the bit about the neoprene ring. I cut it off and everything works fine. Thanks a lot.

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We're happy your all fixed up. Tom