I'm remodeling my bathroom and would like a new faucet, spout, overflow and drain. Can I replace the visible parts without getting into the hidden parts? I have a 1975 era single handle faucet. It turns on by turning clockwise. This increases both the flow and the temp. They can't be controlled separately. The Faucet also has a lever to switch between the spout and shower but no shower head was ever installed. The drain control is part of the overflow rather than being on the spout. What are my options?