The heart of the Ilios HD Kit is its motion. It is highly accurate and very reliable. Although the parts used in the Kit are tough and rigid, it is important to assemble them correctly to achieve the best possible result. Some of the more complex parts may already be assembled in your kit, however it is advised to go through the entire assembly process and check everything twice or even three times before going further. If you have questions about this part of the assembly then don't hesitate to ask for help through the Forum or by contacting us directly.