In addition, a handle is provided at the driving end of the tight wire tensioner of this core, which makes it easy to rotate the core. In addition, this fixed mode is connected with a limit bar through the second movement mode to prevent the deflection of the moving second movement mode and make the demoulding more stable. Fig. 1 is a structural diagram of an embodiment of the utility model with a hooked secondary mold mechanism. Hereinafter, the new embodiment of the present utility is illustrated in more detail by means of a specific implementation. In the attached drawing attached to the specification, the tensioner mechanism contains the following fixed mode 1 shot hole 1, guide bar 12, limit block 13, limit bar 14, first movement mode 2, second movement mode 21, hook 3, torsion spring 31, screw 4, manual wheel 41, mandrel 5, and handle 51.