In addition, said strap tensioner device is connected with a guide bar, said guide bar is inserted into a blind hole corresponding to said movement pattern and a protruding shoulder is provided at the end of said guide bar. In the opening of the blind hole the hand plate tensioner is provided with a staircase that restricts the corresponding protruding shoulder. The guide bar can initiate another guide member between the fixed mode and a motion mode to prevent deflection and to open the mode in a more stable way. In addition, said core passes through a movement mode and a second movement mode, said threads are connected to a second cavity and the protruding end of said core extends into said cavity. The connection of the core screw is self-locking and the core is adjustable into the cavity to change the length of the core