This catch seems to be jammed on our DC25. It won't push in, and I can't remove the canister to empty it - or to fix/replace the release catch. I can't quite make out how the catch works from looking at it, exploded parts diagrams or the pictures of the replacement catch. And so I haven't been able to "jimmy" it open. Can anyone give me a tip on how to get this blasted thing jimmied open?? My house should be this hard to break into!