A Grumpkin after all lives inside the gigantic pumpkin and in order to meet him I must travel inside to say hi. With a tuna can and a large clay loop, I make short work of scraping down the interior surface of the pumpkin. Then a 1/32" steel injector pin is inserted in dozens of locations throughout the pumpkin to get thickness and to plot the location of structural defects. A PaperMate permanent marker is my favorite to draw my reference sketches on the fruit.