Below are the steps to retrofit the toilet:
1. Flapper: Early close and fine tune
2. Handle: New; bend/adjust to fit.
3. Fill Valve: Fix or replace
4. "Tune" the water spot
5. Flapper Valve Seat: Clean it
6. Overfill Tube: Check for cracks
7. Syphon the fill tube
8. Tighten the tank-to-bowl bolts