Tamiya 70230 Centipede Robot Kit - DIY Robotics Project for STEM Education & Hobbyists - Perfect for Science Fairs, Classroom Learning & Robot Enthusiasts

It’s a great idea, but the clutch mechanism is not well designed. If you make the gearbox case too loose, the clutch will engage and there will be no movement and a clicking sound. If you tighten the gearbox case, the legs will move for short time, but then stop due to too much friction. After hours of trying, I could not find a happy medium.All of my shafts and gears turn easily by hand. The problem is the clutch spring.