Q: I have a shower problem in my 40-year-old house. I have three handles: one for the hot water, one for the cold and a middle knob that shifts the water from the tub nozzle to the showerhead. The ...

Q: I have a bathtub/shower combination, and when I pull the knob on top of the spout to start the shower, only a little water comes out of the shower head while most of it comes out of the tub spout.

Not looking forward to your shower giving an operatic performance every time you bathe? It’s a pretty common problem—showers that make an annoying high-pitched squeal when you run the water—but you ...