the top is off (how can i miss the 3rd screw

...yes it is just behind the advance lever)
the prism glass is a cube block, nothing is falling apart (intact on the outside at least)
which has that mysterious diagonal 'slit' across

inside

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--it should be crystal clear, right??...(OH PLEASE, not a internal crack i hope)
AND
the movable part (the reflect mirror) of the rangefinder is hanging loose

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