FAUCET repair tips.
If the washer has become too worn prior to replace, the metal will grind against metal and damage the valve seat. Water particles and mineral deposits can become trapped between the seat and the washer; closing and opening the faucet handle will then grind the particles inside and damage the seal beyond simple washer replacement.
Removing a faucet seat requires a special seat wrench. After removing a seat, it can sometimes be fixed by rubbing it on a piece of sandpaper placed on a hard, flat surface to even out the face of the seat. If the seat needs replacing, take it with you when hunting for a new one. There are hundreds of different seats. Be sure to call the professionals at Plumbing 360 to make sure the job is done right, the first time!