15. You’re almost there. The aperture assembly is next. Remove the three screws that hold it in place. Clean it
thoroughly in the lighter fluid. You may have to soak it several times. Work the blades back and forth. Make
sure all of the old lubricant is removed. Dry the aperture assembly (a hair dryer works well for this).
Lubricate the assembly with graphite. Be sure to get under and between the blades. Work the blades back and
forth to spread the graphite. The blades should move smoothly with almost no effort or sticking. Blow off
any excess graphite. N.B.: Do not use oil to lubricate the aperture. It will eventually gum up again, and oil
inside the lens can cause other problems.
