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I took advantage of the fact that one of the igniter bosses' lockwires was broken off, removed it, and took a photo through the boss (before reinstalling the closure).

Picture 2 of 2.

Visible are some of the shingles on the nozzle extension interior wall and part of the flared base of the engine's throat support, a column topped by a platform on which an engine's injector sits. Thus, the weight of the engine is borne by the injector, rather than the lower portion of the engine, as the nozzle extension was not designed to bear the weight of the entire engine.