Formable stopper

A formable stopper applied to a fixing structure, the fixing structure comprising a body having an assembly hole or an assembly section, the assembly hole or the assembly section comprising a placement portion and an assembly portion, the assembly portion being in communication with or connected to the placement portion, or the placement portion being the assembly portion;

• the formable stopper comprising:
• a formable body adapted to be extruded, placed, or fitted into the placement portion, and extruded, placed, or fitted into the assembly portion, so as to form an interference structure or to form an interference force for preventing or avoiding the formable body from falling out of the assembly hole or the assembly section,
• wherein the body is for assembling to an object, the object comprises an installation portion corresponding to the body, the installation portion and the body respectively have a solderable surface and a corresponding solderable surface, a solder layer is provided at the solderable surface or the corresponding solderable surface, the solder layer is heated and liquidized into liquid solder, the liquid solder is solidified so as to solder the body to the object, and the formable stopper is adapted to stop the liquid solder from flowing into the assembly portion during a soldering process.