Aerodynamic bike helmet!

Step 23 Remove the final piece from the plug!

First, run a screwdriver along the seams you just cut. The screwdriver should be squeezed between the fiberglass and the surface of the mold (see picture). You should see the fiberglass starting to separate from the mold. Next, I repeated this process along the edges where the fiberglass meets the helmet itself. After a few rounds of loosening, I was able to pull the two edges apart and remove the entire thing. Voila!