Great method. Use another cowl as the plug.

I had a Kougar/King Cobra cowl that had not been cut (afraid I would mess it up). The cowl slipped inside of the coke bottle and inside of ten minutes I had a new plastic cowl for experimentation. Forgot the Vaseline. Now if the original cowl will come out. But if it will not come out I have not lost anything but an empty coke bottle.

What a nice solution.

Bill