Because it seems, everyone here is on a open source fetish trip, I have fleshed out my idea of an "open source hinge" a little bit more, just for fun. :rolleyes:
Imagine a compared simple mechanism, basicly only a bolt, a nut, a spring and 2 lock pieces for the actual hinge mechanism. Easily to disassemble and to mod.
It's more or less the same size than the old hinge piece, plus a little longer through the nut. In theory not much modifications are needed to the Pyra case to fit it in (same diameter, same notches), but the main difference may be the hinge piece is put in from the left so it is easily removable after opening the lid through the new designed "bezel" (which I imagine holds the piece in place from that side when the bezel frame is mounted in).
The actual hinge lock pieces can be modified to whatever the user prefers and the spring decides how stiff the lid will work.