Hello, I've just bought a second hand DC27 and I want to put new filters in. My problem is that the post motor filter cover is not like the one I've seen in videos or in the schematic. The one on my machine is grey and is hinged at the rear. I've unclipped the three retaining lugs (front, left and right) but I'm not sure how to get the 'hinged' part off. I don't want to break it so I thought I'd ask if anyone knows whether it is simply a matter of pulling it out of the socket or is there some other 'knack' to it. Many thanks.