Speculum

[Martin Moser]

That's a pretty specialised piece of kit, Martin. I guess if anyone accidentally sits on their pilum, they can come to you. hock:

What a nice way of putting it :-) )
Let me set the soldiering part of the audience here at ease by reassuring them that this piece of equipment firmly belongs to the civilian side of ancient medicine we are presenting ;-) )

Was the screw hand turned on a lathe?

No, although turning on a lathe possibly was the way at least some of the originals were done.