I also use the NFHS mechanics - can't go wrong doing so. However, when I meet with the table crew before the game, I tell them to stop the clock on any whistle. With the size of the players these days, it's often hard for them to see a signal given by the lead on the far side, but I guarantee that when Mr. Fox sings, they will hear it.
IMHO, the hand signal is primarily for the coaches' and players benefit - open hand it's a violation, closed hand it's a foul.
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