i didnt exactly make a one hitter, but it is a very small, collapsible pipe that can fit into one of the larger matchboxes. first, i cut about 3 inches off the top of a broom handle. then, i drilled aabout 2.75 inches into it, and then a hole to meet it perpendicularly. this is the main body of the pipe. about the size of a prescription pill bottle. then i took a 6mm bb gun barrel and mated that to a .5 inch socket. in between, i put a metal screen from a window screen patch up kit. when taken apart, can fit in a large matchbox. it is a hard hitter, cause its wood, but its served me well.