Yeah, if using the joint without a TopHat, it creates a huge bowl. There are stems we sell without the screen installed, it has a taper to keep the TopHat from pulling through. I'm finding the best setup is to not grind with the TopHats or break things up later. The Tubo and my newer Milaana have enough heat power to extract pretty darn goodly to not have to break anything up and not have wasted anything other than yourself. Pardon my english.