12. HOW TO REPLACE THE LOCKING NUT
How to easily replace the locking nut.
1) Using a small screwdriver, remove the locking nut from the extension
2) If it is not already inserted, insert the spring inside the casing of the locking nut
3) Be sure to push the bottom of the spring with a screwdriver
4) Exerting a light pressure, fix the nut into the correct position on the extension