Thanks for all the advice everyone! The diaphragm / suction cap thing seems to be working as it's scrunching up and expanding ok...I think. The second tube bit has been sealed off, but i havent yet tested the second set so I will do that and see if it's a problem with the first set if there is a tear/hole somewhere. I've turned both the cycle and suction dial to the max and can barely feel anything, but i tried again and managed to get one drop. Progress but a very long way to go!!! Fuschia - thatd be amazing if you could take a look at it. I'll PM you. Maybe I'm just doing something wrong and just need someone who knows how to work it to spot my mistake. thanks everyone x