You can always cure that kind of behaviour....screw it up sooo bad, or act like you haven't a clue how fix it. Then he will have to take it elsewhere and never come back for free repairs again.

I feel your pain....I have neighbors and relative that I never see unless they need something or need to borrow something. "Sorry, that's broke down and I haven't had time to fix it."

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If it ain't broke, and you mess with it long enough, it will be.