Hmmm. . . here's how I'd do it.
1. Tie up a dozen or two.
2. Get the flies moist and stroke the hair on the bottom of the fly down, and the hair on top up. Give it a double mohawk.
3. Use a long, thin piece of soft wood or foam (should be a few inches longer than the pan in step 5), and stick the flies into it all in a row, all perfectly straight.
4. Get your dye solution hot and ready in a separate container.
5. Flip the flies over and rest the ends of the stick over the sides of a shallow pan (somethink like a 9"x9" cake pan comes to mind).
6. Pour the dye solution into the cake pan and fill it enough to cover the top half of the hair (which is now facing down).
7. Let them soak or put them over heat, whatever it is that you do with dye (I don't really know).

[This message has been edited by OkieBass133 (edited 14 February 2005).]