if you wish to know the best thing to make an apple pipe with use a cork screw. you just screw it in.. then pull out a perfect hole -- a pen may want to be used for controlling the size of the bowl. i reccomend useing a screen if you dont have a screen keep it a small bowl for the apple by using the inside part of the pen that holds the ink to make the bowl in the top part of the apple. or just use tin foil......
GOOD LUCK!!!!