Until randofo destroys it.
That's why we had to make this fix. His beefy paws ripped the lever from the tank like Mechagodzilla pulling the wings off of Mothra.
Step 1: Parts
existing flapper & chain
*Unnecessary, but awesome.
Step 2: Tie twine to the flapper chain
Survey the damage.
Ignore it, then tie the twine to the flapper chain.
Step 3: Laser cut the acrylic
Feel free to go crazy with the note. Just make sure it's clear that people are supposed to pull up to flush. That'll lift the plunger and allow the toilet to flush.
For those of you who are prepared to say, "But most people don't have a lasercutter!", don't worry about it. A folded up sheet of paper will work just as well. Maybe some cardboard. Cardstock. Use a marker to draw on a pen cap. Get creative.