The AN/PVS-7 is the JETDS designation for a bi-ocular housing named M972 / M973 that was produced by Litton Industries for the U.S. military.
It has been replaced by the AN/PVS-14, but is still being produced by Elbit Systems Of America.
It uses a single MX-10130 format image intensifier tube.
Collimator
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A AN/PVS-7 collimator assembly, comprised of multiple lenses and a triangular prism to duplicate the output image from one MX-10130 tube into both oculars
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When disassembling, lenses and metal rings come out in the indicated order (left first, right last)
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Step 1: Insert the lens with the convex side facing towards the collimator housing
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Step 2: Insert one of the thick metal rings
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Step 3: Insert the thick lens, convex side facing towards the collimator housing
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Step 4.1: Three components needed to be placed together in a bundle
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Step 4.2: Place the metal ring onto a flat surface for convenience
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Step 4.3: Place the lens onto the metal ring with the convex side facing towards it
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Step 4.4: Place the thin metal ring onto the lens
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Step 4.5: The final result should look like this with each component stacked according to their collerated numbers from 4.1
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Step 5: Insert the fully stacked components from step 4 with the thin metal ring facing towards the collimator housing
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Step 6: Insert the final lens into the collimator housing with the convex side facing outward
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Step 7: Screw in the lock ring to securely all the components in place