Activation cylinder

An activation cylinder was a device required to allow a spaceship to fly in hyperdrive. It was often colloquially referred to as a security key. However, presumably, any activation cylinder whatsoever could be used instead of another to the same effect, making the cylinders unlike keys, which operate on one specific lock only. An activation cylinder, a large, opal tube, had to be put into an extensive hole in a navicomputer of a ship.

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