Step 1: Materials
Piece of plastic or tough material in rectangular prism form (see pic)
And last but not least:
A crank flashlight! (must be a squeeze kind)
Step 2: Expand Crank!
Glue the plastic thing on the crank.
Step 3: Put on Harness
Step 4: Use!
Plus it is guaranteed you can find more than this!
Pleas vote for the United States of Efficiency contest!