Ok Window wipers, after a bit of thought for those wanting to "grow" their own poles
The Harris pole can be made 6ft longer by sticking another Harris on it ! Put the no2 section of the second Harris into the base section of the first pole, you only need a collar of approx 10" so cut off the rest. Now the second and third piece will fit inside the base piece of the first pole, . (Some may remeber I did similar with a 45ft unger)
Ta-rar you could do it again with a third pole but its starting to get a bit ridiculous when the best answer is an F16.
Zensorflex can be made longer by discarding the top(first) section of a Harris and removing the threaded cone off the second section, now push this second section inside the base section of the Zensorflex until it jams. then push the base section up also into the base section of the Zensor and tighten up the collar. A simple 6ft extension You will need to rasp a bit of the top of the 3rd section Harris to get a tapered fit.
OR you could go to the timber yard and get a large size curtain pole with a large diameter and shove that into the base of the zensor, shave it a bit tapered like a pecil sharpener, Its parallel so you will need to add tape to increase the diameter so it locks in.
thats a pint ! Its also on matts diy forum
http://diywfpole.webs.com/_________________