I looked in our DC07. I would try removing the top again and getting a long dowel or the opening rod, insert it down into the unit and PUSH. The opening rod opens the latch by pushing it, not pulling it. Here are some pictures of the latch. Top pic is in the unlock position. Bottom is the normal position.
I hope this helps.
How do I clean the radix assembly of my DC07 Dyson?. (video)
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when the dyson extension rod is in place, the bottom of the rod is pushing open the trap when operating
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