slacken all the twist clamps, extend the pole, i normally put the brush on a fence or a bush, put your fingers over the internal hose at the end and lift the pole, it stays extended. the brush will move but not enough to stop you cleaning. when done, tug the hose and it come flying down,
watch it doesnt catch the hose as it comes out the pole, mine split last week. pulled it off and kitchen scissors were all that was needed