A crimping device includes a housing defining a bore and at least three extendable mechanisms angularly equispaced about the axis of the bore. Each of the extendable mechanisms include: (i) a first elongate arm hingedly connected at or near a first axial end of the first arm to the housing; (ii) a second elongate arm hingedly connected at or near a first axial end of the second arm to the housing, wherein: the first axial ends of the first and second arms are displaceable relative to each other; and the first and second arms are hingedly connected at or near their second axial ends to each other. The crimping device further includes means for equi-displacing the first axial ends of coupled first and second arms relative to each other, thereby to configure the crimping device between: (i) a dilated condition in which the second axial ends of the first and second arms are maximally spaced from the bore axis; and (ii) a contracted condition in which the second axial ends of the first and second arms are minimally spaced from the bore axis.