M-94 Cipher Device (WWII US Army)

Google Image the name to find lots of photos of what this is supposed to look like completed. Still needs a bit of tweaking: I haven't worked out how to do threads yet, hence the optional knob with hex hole in it for inserting a 1/4 inch nut. Also a shaft end with a square hole through it to take a 1/4 inch coach bolt.
Obviously a cipher device is not much use without the letters on it, but not only will putting all the letters and text on the parts take ages, they'll be so small that few extru