Pictures : instrument assembly:(A) Lower optical train showing prism box, spacers, and lower periscope.

Pictures: instrument assembly:(A) Lower optical train showing prism box, spacers, and lower periscope.

(A) Lower optical train showing prism box, spacers, and lower periscope.

Description:	Drill a 3/16" hole in two of the Prism Box Standoff Spacers so that an allen wrench can be inserted through the holes to tighten the screws which lock the Light Lever Pickoff Tubes in place.
Category:	instrument assembly
Assemblies:	Lower optical train

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