On a recent call to repair a running toilet the owner had said “all the sudden it’s like one day it would’nt shut off” so of coarse we went to have a look? After discovering everything was in order
on the fairly new loo, the procedure went straight to flush. And flush after flush, on every third maneuver the handle stuck just enough to hold the flapper valve ajar to leech.
The tank has a square hole in which the handle protrudes and locks down on the inside with a plastic nut, the pivot points quarter turn and then return in waiting it’s next duty. This plastic assembly though is produced from a man made mold, and still had an over pour nub in just the right spot that caused it to not allow the proper return. Disassembled, with a sharp utility blade I shaved the nub a shaped the over pour in which disallow no more undo friction. Reassembled and tested several times aided by the visual inspection of a new efficient working order. Hey, things just happen, and the DIYer sometimes has to make them not happen.