Nikon Epiphot 300 Manual page 27

(9) Insert each of the two centering tools into the
screw holes for field diaphragm centering.
(10) Stop down the field diaphragm to make the field
diaphragm image smaller than the eyepiece
viewfield. Rotate the centering tools to center the
field diaphragm until the the field diaphragm
image and the eyepiece viewfield are concentric.
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I Each of the centering tools reaches the limit when it is rotated clockwise :
: in the screw hole. Do not rotate it further with excessive force. If
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1 rotated forcibly, it may be damaged.
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