Sorry, but this has to be said.
Tell the wife "No biting". If she continues to bite, STOP THE LESSON, and pour your self a tall, refreshing glass of Mug Root Beer.
Oh...spoke nipples....my bad. A small pair of vice grips works for me - until I can replace the spoke and nipple.
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"Let us hope our weapons are never needed --but do not forget what the common people knew when they demanded the Bill of Rights: An armed citizenry is the first defense, the best defense, and the final defense against tyranny. If guns are outlawed, only the government will have guns. Only the police, the secret police, the military, the hired servants of our rulers. Only the government -- and a few outlaws. I intend to be among the outlaws" - Edward Abbey