I have a Yamaha 631. I push the spitball in as far as I can with the blunt end of a pen or pencil whose diameter is smaller than the leadpipe. I'm careful not to lose the pen or pencil inside the leadpipe by pushing too far. You probably don't really need to push it in that far but I find it is easier to blow for me the farther along I've pushed it in. I then remove the pen or pencil and put in my mouthpiece and blow hard and fast. I also hold one hand in front of the bell to catch the spitball. Works for me!