Wooden model kit made of birch (4 mm) and poplar (8 mm) plywood. Requires PVA glue (not included). Turning the crank activates a cam that lifts and drops a hammer in rhythmic motion. The mechanism is inspired by an original drawing by Leonardo da Vinci (Codex Madrid I, folio 101r), where the hammer floats mid-air, the model adds a discreet support to make it stable and easy to understand. Perfect for schools and workshops, it’s an engaging educational gadget that’s fun to use and rich in mechanical meaning.