Step by step instructions for the front-mod:
Step 1: Find some surplus tips made of thin silicone, e.g. Sony hybrid tips.
Step 2: Cut off a small stripe, about 1x7mm.
Step 3: This is the tricky part. Place the stripe alongside the nozzle, so that it protrudes about 1mm at the front end. Hold it carefully in place with your fingertip as you mount the silicone tip.
Step 4: Check the result - it should look like this from the outside.
Step 5: Check the result - it should look like this on the inside. Make sure that the stripe protrudes only a tiny bit at the edge of the nozzle, or else it will diffuse the sound.
Congrats, you've successfully completed the mod. http://files.head-
fi.org/images/smilies/smile_phones.gif