I keep reading many people's stories and methods on how to make apple pipes, and many of them require the use of foil or some other metal or non-apple screen. The way to make a pure apple pipe is this. The bowl first off, is already there for you. Pull out the stem, and nature has made a bowl for you. The key to modifying the bowl is to not poke a hole down this part, but to make a few slits. Any kind of knife, butter knife or pocket knife, and sometimes scissors are good for making the slits down into the core of the apple. Make 2 or 3 slits, sometimes you might have to widen them out a bit with some bending back and forth, but don't make them wide enough where weed falls down. Make the mouth piece on the side of the apple by making a normal hole that connects to the core. A similar tunnel for the carb as well. Test the airflow and make any changes needed. The knife slits going down from the bowl should meet and flow air to the mouth piece. If you need a screen, I have found peeling a fraction of skin from anywhere on the apple, and placing it over any holes in the bowl is good, as the smoke goes around and down the slits. Now you know how to make an apple pipe without that nasty foil.