Fixing stuck hollow metal telescoping 3 section pole used to replace light bulbs
 

I have a hollow metal 3 section (2 telescope) pole that is used to replace light bulbs in high places. Each of the two telescoping sections rotate easily but will not extend no matter how hard they are pulled. I have sprayed the collars around where they extend with WD-40 and wiped them dry. Still no luck.

Does anyone have a suggestion, or possible fix???????

Thanks
DBW86