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4. Grasp the lamp retaining ring as
shown. Push inward slightly, and rotate
clockwise (the top to the right; the
bottom to the left) to release the
retaining ring from the shoulder screws.
5. This photo shows the lamp retaining
ring in the removal position.
The spring will tend it push the
retaining ring outwards when the
shoulder screws line up with the
openings. Do not drop the lamp or
retaining ring.
6. Pull the lamp and ring outward from
the instrument as shown.