What component was specifically designed to hold small corrective mirrors for instruments that could not be replaced during the service mission?

Answer

COSTAR (Corrective Optics Space Telescope Axial Replacement)

COSTAR was an instrument inserted into a bay specifically containing small, tailored corrective mirrors to assist instruments that were not being swapped out, such as the Fine Guidance Sensors.

What component was specifically designed to hold small corrective mirrors for instruments that could not be replaced during the service mission?

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