Plug and rod mounted in vise. This arrangement will allow me to rotate the plug as I heat the plastic.
I did a couple of tests - here's the second one before heating. Screwing the cowl onto the plug at the front is a lesson learned, as are the cords at the bottom for tension.
Test #2 on the plug. Note the milky-white plastic - that's an indication of too much heat (as is the hole!).
Here's the test piece off the plug.
Time for the real thing.