The plant operates in a clean room. Blister packaging protects the medical products and a cover film subsequently seals them. Its roll is 500 mm broad and correspondingly heavy. The foil needs to be merged trough the entire feeder at each change and the new film is adhered to the old one at its end. This time-consuming and costly procedure should be simplified: The optimized “adjusting aid”, which pulls the cover film into the right position, speeds up the adhering process of the two films. Plain bearings from igus® allow a quick, reliable and primarily cost-effective installation and disassembly.