Review on Enhance Your DIY Robot Project with the LAFVIN 4DOF Acrylic Robot Mechanical Arm Claw Kit — Perfect for Arduino IDE with CD Tutorial! by Christine Ellis

The PDF they send has you guessing the steps as the pictures reverse the direction of the parts after they have just been put together. They don't cover the order of connecting to the server at all outside of code. The cable connecting the servo to the claw is too short and will release itself when the lever is fully extended. Also, the high side server tends to stay in rotation, well the servo doesn't know any better and won't stop reaching the angle you told it, this will cause it to overheat quickly.