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Design For Locking Plastic Piece

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I'm a newbie / non-professional product designer working on product with a plastic piece about the size of a quarter (.75" diameter, ~1/8" thickness).




What I need to do is have the quarter-sized piece "lock" into place to another plastic piece when it's pressed onto the surface of the other piece.


I want the piece to be secure so that it requires a release button to unlock.




What I'm looking for is something similar to a locking watch band where there is a post and a release button on the side:






This is the ideal solution, although the quarter-size piece is so small, the locking mechanism would be tiny, probably costly and prone to breaking.


Does anyone have any suggestions on how to achieve the locking feature on such a small part?

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