Have an older Peerless faucet with two clear plastic on/off knobs and the hot water side is leaking. Turned water supply off and took handle off on the hot water side and there appears to be a plastic cartridge inside with an O ring on the outside of the cartridge and smaller one inside. Will just replacing the O rings solve my problem or do I need to replace the whole cartridge? Or, is this even the problem as to why the faucet is even leaking?