8. Carefully remove the lens and rinse it with cleaning liquid
to wash away coarse soiling.
9. Check the lens for sign of damage.
10. Put some cleaning liquid onto the lens and leave the
liquid for 1 minute to take effect.
11. Soak a cleaning tissue with cleaning liquid and carefully
wipe off the surface.
12. Now carefully insert the lens with the convex side up into
the lense holder.
13. Insert the sealing and clamping ring and fixate the
clamping ring using the key tool.
14. Carefully insert the lens with the lens holder into to laser
head and fixate it with the lense fixation screws. (2
screws)