I have an 11 year old, single handle shower control that when turned off has dripping. I have taken off the handle, etc and am at the wall. What is the next step or steps?
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After you remove the chrome collar and plastic collar washer (behind the faucet handle), pry the beauty plate off the wall. Turn off the house main water supply. Remove the four screws and washer holding the cartridge and valve stem in place. Save the metal washer under the four screws for use with the new cartridge. Replace the stem/cartridge assembly and secure with the saved metal washer and four screws. Reinstall beauty plate, collar & collar washer, then handle.