It's just a simple catch, really.
A hook that latches underneath something.... honestly, I can't remember how I engineered it. There are two copper pipes that act as rails, and a piece of wood which is pierced by two holes, through with the pipes fit. That piece of wood is lifted by a steel spring when the catch holding it in place is released. If you watch the video you'll see that I press the 'S' button back into place as I push the top back down.
The spring assembly really provides a strong "ka-thunk" when you press that button in!!
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