The situation can arise when a toilet may not operate correctly no matter how much adjustment is made to the flush and fill valve.
Depending on your problem you may be better of replacing either your flush or fill valve.
The flush valve on a toilet is used to release water into the toilet tank into the bowl when the button or level is depressed.
The fill valve is used to re-fill the toilet tank once after it has been flushed.
We stock flush and fill valves from FlushKing that can be used to fix a broken toilet. Also shop for urinal automatic flash valves.