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How to use a pendulum
Know that a pendulum is a weight hanging freely at the end of a string.
Before you start using a pendulum, you need to know what it is and how it works. Luckily, a pendulum is no more than a hanging weight allowed to swing back and forth.
The string is attached to a fixed point so that only the weight and string are moving. Hold the end of pendant necklace or yo-yo between your fingers and move the " weight " at the bottom.