Instructables

Step 4: Step 2 - Adding an Amplifier

Place the other end of the straw over the tip of the cone cup and draw a circle on the cone around the end of the straw. Cut off the tip of the cone. Starting with the flaps, run the straw from the open end of the cone up through the hole until the straw is almost all the way through the hole. Tape the straw to the cup. 
 
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