LEGO MOC Escapement Mechanism by JKBrickworks | Rebrickable - Build with LEGO
GBC 49 Geneva Drive – 42120 Building Instructions | PV-Productions
Amazon.com: The LEGO Spike Prime Discovery Book: Mechanisms, Robot Architecture, Design, Programming and Game Strategies for FLL, WRL and WRO: 9798362511920: Dwivedi, Rajeev, Dwivedi, Indira, Dwivedi, Bharat: Books