20 Source 4WRD Installation and User Manual
Clean 5° and 10° polymer lenses
To quickly clean the lenses, remove dust with a blast of oil-free air. If
this is not sufficient, follow these steps.
CAUTION: Handle polymer lenses by their edges only. Never rub
anything dry on a polymer lens.
1. Remove the beam focus knob at the bottom of the barrel.
Remove the lens tube from the barrel.
2. Use a Phillips screwdriver to remove the brackets that hold the
lens in place. Remove the lens from the tube.
3. Dip the lens in a clean isopropyl alcohol/water mixture (9 parts
water to 1 part isopropyl alcohol).
4. Use a soft moistened nylon bristle brush to wash the smooth
side of the lens in a linear (non-circular) motion.
5. Use the same brush to lightly wash the ridged side of the lens
by following its ridges.
6. Dip the lens in a clean isopropyl alcohol/water mixture (9 parts
water to 1 part isopropyl alcohol).
7. Dry the smooth and ridged surfaces with an air gun. Make sure
that the air flow moves liquid away from you.
8. Inspect the lens for dirt. Repeat steps 3–7 if necessary.
9. Set the lens back in the lens tube with the ridged side facing
the front of the tube. Reinstall the lens brackets.
10. Slide the lens tube back into the barrel with the retaining clip
for the color frame on top. Reinstall the beam focus knob.
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