I was changing the power steering box in my van the other day. Had it in and was bleeding the system by turning lock to lock when all of a sudden the steering wheel just went round and round. Had a look and the flange had come off the steering shaft where it attaches to the flexible coupling. Damn glad it happened in the shed and not on the road! Ive never seen this before and was wondering how common it is?? Any similar stories out there?