I don't have one, and apparently they are difficult things to find.
A guy who I used to work with has a 3D printer, so it's possible that I could manage to get one printed off, or something very close to the original at least.
The problem is that so far I only have a few photos lifted from the Interweb thingy.
I'm not sure the of size limits of the 3D printer yet
What I could do with is a few square on photos of one with a rule or tape measure included in the photos.
Is there anyone on here who has a loose one that they could spare the time to take a few snaps of please ?