When constructing the Nevermore Micro V4 fan you need to glue it in a centered location. If you do not get it exactly centered the fan can rub on the outer casing. I created this tool to help place the fan perfectly centered. The tool should slip over the fan blades. When you place the fan in the Nevermore the outer part of the tool should just fit thus placing your fan perfectly centered. Hope this helps someone out there. It definitely helped me to glue the fan perfectly centered.
The author hasn't provided the model origin yet.