There is a German word, Krank, the same but spelt with a capital “K” instead of a “C”. It is often used in the German language and means “ill”, so a word in daily use. You could also say “Er ist krank” having a double meaning that he was not really thinking straight, but we are in an english based site.
I remember in my younger days in the fifties seeing cars parked at the roadside. The owner would arrive, and turn on the ignition and nothing would happen. It would be necessary to operate the crank shaft in this case, which was somewhere hidden in the car. Every car owner had a handle. He would attach it into a hole at the front of the car in the middle, below the radiator and turn the handle. This would turn the crank shaft to put the motor into action. This was usually accompanied by various profanities as we all know a work needs profanities to help. Eventually the car motor might make a noise showing its good intentions, and then would die again. Another turn and if you were lucky the engine would decide to react, and the driver would jump quickly into the seat and drive away. That is the only memory I have of a crank.
And now for something completely different. Mr. Swiss called me outside yesterday with my camera. He found a good subject hovering over our home. This did not need a crank shaft to set it in motion, it was a hot air balloon. There were two of them hovering in the air so I was ready for a prize winning shot. Nothing particularly special, but neither is a crank.