No argument at all my friend...life is too short and we are all quite blessed. I am familiar with both. One way to tell the difference is that the frost free ones have a long straight stem, usually between 8-12 inches as you state, so the washer is inside the home away from the cold. The handle is coming out of the home straight...the non frost free ones typically found here are often angle stops, where the handle is at an angle to the house wall. To answer the original question, the chatter can come from either the anti siphon connector or a loose stem nut itself....both an easy non invasive repair.
Frank D'Angelo
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Florida licensed Home Inspector #HI688. (352) 250-7818
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