I spent a few minutes at the workbench yesterday and came up with a rough out of “Dave’s 5 Cent Koma”. It sounds a little warmer than my bamboo koma.
2 pieces 1/8” diameter dowel, each about 2.5” long;
1 piece 3/16” bamboo chopstick about 1.6”, tapered for aesthetics;
dab carpenter’s glue; fine sandpaper
Finished height 7/16” (8mm)
Cut two smaller dowels, glue and clamp. When glue dries, center chopstick dowel, glue and clamp. When glue dries, sand bottom of small dowels if desired to adjust height of koma. Measure grooves for strings with pencil, score with fine files.
Put under strings at your preferred place, and enjoy!