You need to fit a small piece of Unger No1 section into the No4 section of the Zensor flex so that you can then attatch any unger tools to it. Use an unger adjustable cranked angle and cut the 6" longest part alu tube in half, use the cut off piece (about 21/2 - 3" approx) and glue it tightly inside the No4 section. You need to cut the N04 section back by 2" increments until you get near to the diameter of where it will just slip inside the No4 then carefully cut 1/2" increments. Fix it in with araldite pasted inside the tip and drill some small holes in the alu to allow it to key with the glass fibre section.
I used to use the No3 section and just fit the alu onn the outside of it but the above is far stronger.
Right having done that the rest is easyish, the new N04 section with the Unger tip will now just push fit over the No5 section of the reload. Check it now before you do the above. This section should also fit any other make of tapered pole.
I think I posted a link for you to a pic of this previously. You can still use the previouslt cut down cranked elbow attatched to do swivel tricks if you can drill out 2 new click connect holes.
Start practising and using just the Zensorflex with the other sections added to give yourself time to get used to the modular concept, then in a few days try the Reload, the difference in comparison is nothing short of staggering
I suggest you use a brush of no more than 10oz,(Addis or Bently) and if it is heavy to keep the pole vertical whilst assembling. Use pvc tape for padding the tapered pole to prevent wobble anywhere you fit tools etc.
Next step. Sometime later - convert your hose to Algarde silicon its better than any hose out there.