Flush stopcock flap contained by toilet won't close. Do I necessitate to replace it? I have tried shortening and longering the cuff attached to it and...

I have tried shortening and longering the cuff attached to it and the handle. I don't know what else to do. I saw where on earth if you empty out the bowl and put a gallon of vinegar within it may help. Any other philosophy? Toilet just runs and won't stop after it flushes. Thanks.
Why would lights contained by my house flicker...
Answers:    you will involve to change the crawl valve, and consequently possibly the flapper. to check the flapper. pour some food coloring into the tank. contained by about 5 minutes or so, if the wet in the bowl is shifting the flapper is bad. the flapper have noting to do next to the toilet running. get a fluidmaster 400A and it will lapse you problems...about 30 minutes to install it
Where do these household appliances walk?
replace it it is too matured rubber has expanded