The plumbing technique, also called plumb-bobbing, relies on using a dangling putter to provide a vertical counterpoint against which the horizontal slope of the green can be evaluated. Unfortunately, the practice is widely misunderstood and misused.
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Many golfers believe that the plumb line provided by the putter will not line up with the ball and the hole, and that the difference indicates the break of the putt. This belief is nonsensical: The alignment of ball and hole with the vertical is purely perspective. If they don't line up from one angle, all you need to do is move over to a new spot. The plumbing technique can still be useful, however, as a means of orienting the green's slope with the vertical.