There is a short story by Theodore Sturgeon about a man who can fix anything, by feeling around it (like getting vibes), and then whacking it in just the right place. The story is told from the point of view of a younger relative (I believe nephew) of the man. The narrator is a bum of a kid who is never working and always borrowing money. Through the story, it is revealed that the man can fix people, too, and he fixes the narrator by striking him in just the right manner.
I loved this story, and want to track it down, but I cannot remember the name of it, or what book it appeared in.