This is why I hated renting. Since when is it YOUR responsibility to buy a new door knob? It's HIS responsibility to buy the knob and install it and I would have told him so. I know my SIL never said anything to his landlord because they would get behind on the rent. Something we never did but still had crappy landlords. If we are forced to rent again I am not painting, cleaning nor fixing a darn thing. In NYS renters have rights.