New easy working reverse design mechanism with large level-sub-lever relation for uninfluenced sensitivity even in extremely heavy loads like in the case of multi-band spearguns. Construction with low working profile and increased endurance. It comes with side line release on the back side of mechanism. Designed for European type shafts 6-10mm thick. The CAM manufactured stainless steel parts ensure its high endurance. Package includes pins and rivets for mounting as well as an installation guide, for easy and safe installation in the body of the speargun. Ideal suggestion for application to wood and carbon DIY construction.