This are some adapters for Swiss Cylinders. Even if the pin of a swiss cylinder with a knob will fit inside the nuki pro, it will wear out over a short period of time, because the contact points are very small by default. So i made the door knob adapter, it requires you to drill a hole in your pin, i drew a 2mm hole and cut the allen key that came with the nuki to length. I sticked the cutted allen key the new my hole as an extension.