heres what i did.
take the black threaded end piece, off the tip of the Harris pole. i screw the angle adaptor to this, by softening the plastic over the gas hob, and screwing it into the angle adaptor to cut a thread.
cant use the top 2 as they are to thin.
cut the next section down so the black end of a Harris will push very tightly over the end. you might need to keep cutting a bit off at a time until your happy.
kind of critical not to go to far with the cutting!
then push the off-cuts inside to give a bit more strength. put the brush on, and theyr'e you have a 30ft pole.
do not stand on the sections like i did. they will crack