When i first read about these I decided to have a go at doing the same with my supermax 40.
The number one section was removed and the pole hose cut so it only fed up inside that section to the brush.
I fitted an easy snap male connector to the end held rigidly in place with expanding foam in the last couple of inches of the pole capped and sealed with polymorph
https://www.youtube.com/watch?v=IhVuc6RNyaw so that the male connector sat just proud of the end of the pole section.
Female connection on streamline lite 5 hose is now removable ( or can be left connected to pole and reel if I wish ) the hole in the base section end cap has to be cut slightly larger to allow the female fitting to go up inside the pole when extending.
I now have a very easily maintained and versatile pole that can easily have sections removed or added very quickly, in fact I only carry the one supermax 40 pole on my van now. I finally found a way to buy just the one pole to cover all my work ( no need for a 40, 25 and 18 as a sole trader, I can only use one pole at a time anyway so why buy 3 ?)
Have used this for 6 months and not had to change either fitting, the female connector never gets dragged and when in use even slightly extended by an inch is protected from damage even if I leave it connected.
I maybe wrong but I think what I've descibed as having done above is the same principle.
I think this is a very innovative idea, the only reason I'm not buying one now is because there is so much life left in my supermax and so without being able to source the relative parts and convert my gardiners pole at the time decided to diy it