An enquiry asked for the assembly of three metal components consisting of a half cylinder and two cover plates consisting of three different lengths of 70mm, 100mm and 170mm. Without the aid of a device helping to assemble these components, it would have been very difficult for the workers to assemble these components as the screws were not tightened in a thread, but had to be placed in a notch during the screwing process. This meant that they only had one attempt for this option. A possible second attempt would have damaged the components. Furthermore, the sensitive surface of the coated covers had to remain intact. Such damage would be produced by any screw placed outside the drill hole.
You can find a PDF with the project details here: (PDF in German)