New easy working reverse design mechanism with large lever-sub-lever relation for uninfluenced sensitivity even in extremely heavy loads [multi-rubber guns]. Construction with low working profile and increased endurance. It comes with side automatic mechanical line release with spring reset and covering window. Designed for European type spears 6-10 mm. It covers the possibility of clipped line in the spear tail [6-8]mm. The CAM manufactured inox parts ensure its high endurance. Includes pins and rivets for mounting as well an installation guide, for placing for easy and safe installation in the body of the speargun. IDEAL SUGGESTION for application to wood and carbon DIY constructions.