When the hot water flow through my kitchen sink sprayer is low or on
full, it is quiet, but when the flow is at about 75%, it "sings" very
loudly with a loud high-pitched tone. With cold water, it is quiet at
all flow rates. I have taken the faucet apart and don't see anything
wrong with it. It is a single faucet with a lever type handle that
delivers both hot and cold water from the same faucet. Any ideas on
what could be causing this?