The metal washer IS the pendulum bob, or should be directly part of it, so yes, the washer needs to be directly on the bob.  If the washer were above the pendulum bob (such as on a string), then any actions of the bob below it wouldn’t count as completed events.  Make sure the washer is directly part of the pendulum bob for judges to see, and not considered noticeably separate from any parts of the pendulum parts.



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