This is because the trigger is structurally weak. First, fix it with instant adhesive on the broken section, heat and melt a few stapler wires with a soldering iron and plant them, and then smooth the surface with a soldering iron to make it flat. It becomes very strong. The repaired surface is hidden inside the case, so you can complete the repair perfectly. Even if you replace it with a new one, it will break again because it is structurally weak, so it is better to provide structural reinforcement.