David68 , by the sounds of it your using the same pole i did when i started out , i looked at it as better to get a longer pole than one is too short , after 12 months of breaking my back i went for the 18 foot extender , 3 sections , it is longer than you think , and what a joy to work with compared to the heavy duty 4 section you are using , dont get me wrong its a spot on pole but dont kill you back , ring Alex at Gardiners or Rich at Varitech 01752 263333 , sorry dont have Gardiners number to hand !
Rich P @ F