Reverse trigger mechanism for thermoplastic handles with loading pad. Installation comes with a minor conversion (as it concerns the loading pad) in spearguns with thermoplastic handle. It cooperates ideally with side, interior or exterior line release (not included). It offers 9.5 cm longer loading length relatively to a classical forward mechanism and has excellent aiming view. The innovating design and patented function offers high sensitivity and function, while the CAM manufactured inox parts ensure its high endurance.