Detail of the round index pin on the second LOX dome; this photo was taken approximately 180° from the previous photos (under the intact LOX inlet).

Two index pins, one round and one diamond-shaped were used to ensure that the LOX dome and injector were properly oriented on the thrust chamber. In addition to being differently-shaped, it appears that this round index pin has a slightly smaller diameter than the diamond-shaped index pin.

Photo Credit	Kansas Cosmosphere SpaceWorks division
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