PROBLEM TO BE SOLVED: To provide a mechanism for elastically holding a timepiece component on a support element. An elastic holding mechanism 1 for fastening a watch component onto a support element, at least three deformable, with a free end 9 defining an opening 12 into which the support element can be inserted. Including a rigid portion 7 having an inner surface 6 with an arm 4, the arm 4 is configured to perform coupling with the support element by elastic tightening in compression of the support element in the opening 12. [Selection diagram] Fig. 1
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