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The XO Paper Viewfinder, comes in white (the new green)
you need a piece of paper, say 6 cm x 4 cm. Size doesn't matter really.
Fold it in half lengthwise (“hotdog” style)
Cut from the fold to form a frame
which looks sort of like this
Then add a piece of adhesive tape
Trim top and bottom
Then trim so it's narrow, say about 5 mm wide
This is important so the tape doesn't cover the lens
Tape it to the edge of the XO, right by the lens
You can fold in the viewfinder to close the XO
It's paper, you won't damage your screen,
and you won't lose your viewfinder
Open it for use.