Q: The cold-water faucet in my shower has developed a continuous drip. I’ve never tried to change a washer in a faucet before. Should I try to do it myself or call a plumber? Is it only a matter of turning off the main water supply, then taking the faucet apart to find the washer to replace, or is it more complicated?

I don’t know the make and model, but the faucets have been here since before I moved in more than 20 years ago.

A: Nearly all modern showers have a single mixing valve that combines hot and cold water. You have the old-fashioned type, meaning you have to adjust the hot and cold separately.

This is something you can and should do yourself. You can take an hour of your time and 75 cents in parts or call a plumber and receive a bill for around $100.

Here’s the step-by-step process to change a washer:

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