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Design philosophy of the ball-joint and foundation

The design of the hinge is based on two requirements. In the first place the hinge must be exceptionally reliable and solid. The other requirement was ease of inspection and maintenance after positioning.

The steel plates in the core are separated so to provide room to walk. The hollow pedestals and spheroidal shells are separated at rest, while the ball- joint can also be jacked up from the pedestals. This design means that the shells and pedestals are readily accessible for maintenance and inspection purposes when at rest.