Shower option
Instead of taking apart the shower mixer, you may want to install a copper tee with an adapter above the mixer that has treads into the cold water line. When closing for the season I open up the adapter, turn the shower handle to mid point and feed anti-freeze(safe) down until it comes out the bathtub faucet. Been doing for 30 years, no problems. It easy for me to get at the back because I have knotty pine boards that I didn't nail and have a small handle to pull out.
Dave M
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