I’m trying to help a friend design a small toy and she needs a mechanism that will click in very small increments as she rotates a small (1 inch diameter) dial that turns 360 degrees on its axis. She needs the dial to click precisely as it turns clockwise and counterclockwise in smallish increments. I was thinking a fishing reel mechanism might work, but that just allows turning in one direction. Then I thought a ratchet wrench mechanism might work, but that also turns in just one direction (and I’m not sure how the inside of a ratchet wrench works either). Can anyone think of existing toys or devices that have a clicking mechanism that freely rotate? Novel solutions? Suggestions? Thank you!

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