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12 o'clock flashers - this is not for you
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Step 1 - unlock the focusing screen metal spring clip
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Step 2 - lift out the metal spring clip
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Step 3 - Remove the OEM focusing screen
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Step 3 Continued - Brass shim being lifted out
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Dropping in the screen
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Clean out the penta-mirror assembly
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Cleaniness is next to Godliness.
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This is what you're installing!
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Step 3 - Remove the brass shim
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Step 3 continued - removing focusing screen
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Reverse the take-down procedure for installation.
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Brolley on Bogen Super Clamp
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Strobist setup for camera operation