This micro-sized geocache is disguised as a rock. I made this by 3D scanning a rock and merging it with a screw assembly. The inside is large enough to hold a roll of paper for geocachers to sign. Assembly: Give the outside a good sanding. Screw together the body and screw piece tightly. Superglue the end cap to the screw piece. It's important everything is tight so that it all lines up. Paint it with some granite spray-paint and hide it!