My Mother has just bought a refurbished V7 from Dyson on Ebay. You need to pull on the red lever really hard to start the bin moving and she does not have enough strength to do this using two fingers under the lever. Dyson offered to replace it, which seemed pointless if they are all the same, so I measured the force required on the red lever to release the bin. It took 4kg to start it moving and almost as much to pull it all the way and realease the bottom lid. I repeated this test many times and 4kg was the average figure, when pulling with a spring gauge at the optimum angle (upwards and slightly rearwards). We asked Dyson if this was normal and they have not replied! Can anyone tell me how much force it takes to open their canister?