A segmented pepper grinder

[SceneryMaker]

Very nice! Is there a nut at the top to hold the pieces together and control grind fineness?

I couldn't find a mechanism long enough so the assembly & control nut is actually buried in the top half. The real crank knob with the nut on top is only the walnut ring and the one above it. The upper 8 layers screw onto the crank knob with brass male and female threads made from garden hose fittings. The upper 8 layers are the secret to getting the extra length.

[SceneryMaker]

The threads look like this. The thread rings were epoxied in such that the mating segmented rings are aligned correctly, making the threaded joint invisible.

[EightFingers]

You did a VERY good job on aligning those...