Heat, grease, dirt, extreme forces and sensitive components, the failure of which would result in disproportionately high costs. In the steel rolling mill, sheets weighing several tons are rolled down from 250 to, for example, 20 mm every minute. The final thickness of the sheets can be adjusted via the distance between the top and bottom rollers. Penkert bellows reliably protect the adjusting cylinders and spindles for many years. The last time we had to replace a bellows on a worm gear screw jack was after 35 years. The drawing and the manufacturing instructions for this bellows were kept in our document archive and could be examined and prepared accordingly even after this long period of time. It only took a few days to manufacture the new bellows.More information on this project is available on request.