This is a two part design to install a Cam to see the Ultimaker 2's print.
Simply stick all components together (may be you have to drill the holes with 8mm drill bit) and click on it to the Ultimaker2 front frame.
You only need both of these components and an aluminum (or other) stick or pipe with 8mm diameter. The length of pipe or the stick is currently depending on your camera and the view angle. To correct the camera at Part2 zip ties can be easily used by you.