Releasing the snags is quite an important issue in bottom fishing. The ingenious fisherman from the Moselle river came up with an interesting way of doing it and 'patented it” a sinker on a reflecting spring. It is attached to the main line with a carabiner with a safety pin. A ground weight is tied to the other end of the spring. In the case of a hook, you only need to tighten the line tightly and quickly release it. The stretched spring shrinks rapidly and the energy of this impact "catapults" the lead from the catch.