The right one. Get a set. Try different sizes till you find one that fits snugly. No wiggle. There are american sizes and metric sizes. Get one of each (probably $20 at home depot) Northern Tool and Equipment way cheaper. Ebay, sometimes cheaper still. Or go to Home Depot or Lowes with a photo of your kitchen faucet and see if they sell one that looks like it, and see what it uses...
SOURCE: I have a single -handle
Should be coming out if head not stripped or threads inside at set screw aren't stripped. Can you tell at all with perhaps flashlight if set screw is turning at all? Look like it backing out?
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