---

Even simpler and possibly a better system than floating a fly in acetone is the following.
Use a shallow polyethylens food container with a tight-fitting polyethylens lid. Drill or bore a hole in the lid and insert a wine cork. Pin the fly to this cork and have just enough acetone
in the bottom so that the fly is just immersed (upside down) in the acetone. Very easy to retrieve the fly.