I found this screw in a 3/8" copper riser under a bathroom sink... Obviously the faucet flows better now.
You would expect it to be the screw that holds the washer onto the bottom of the stem, so I checked that, and there is a brand new screw and washer on the bottom of the stem.
I guess the screw dropped and someone came along to fix a dripping faucet but never thought to go looking for that missing screw...
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