The invention relates to a timepiece comprising a racket body (1) having a first support member (4) and a second bearing member (8) arranged on the mated body (1) one in front of each other, the first supporting member (4) and the second bearing member (8) being intended to bear against an outer turn (7) of a spiral spring of a motion control device clockwork. According to the invention, said supporting members (4, 8) are arranged to occupy at least a first state, wherein said outer winding (7) is to be clamped between said supporting members (4, 8) and a second state, wherein said outer winding (7) is intended to be released. The play between the pins (4, 9) in a conventional racket can therefore be removed without exerting excessive force on said outer coil (7), while allowing for easy adjustment of the active length of the spiral spring.
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