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In this cross section showing the regenerative injector assembly, the three components that make up the injector can be seen (baseplate, centerbody, tip). The pintle tip threads into the centerbody via an ORB fitting. The centerbody interfaces with the baseplate via a bolted taper, which we chose to mitigate pintle concentricity issues. However, we still shim the annulus during assembly to make sure the annulus is fine (its width eyeball concentricity. Our annular gap is 0.01").
You can also see two ports; the left port is for probing fuel manifold temperature and pressure, and the right is for the igniter (see the ASI section).
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