Telescopic locking device problem and solution

This is mainly about telescopic poles problems. In my case it is a tree pruner of which the poles got jammed and would not extend or retract. but I had similar other issues where the locking device would not work any more. I have trouble with the speaking part but hope you'll understand. At the end I added a written version with a portion of Albinoni Adagio for comfort! So much for Albinoni it seems that I should not have use it!