My 3€ headphones broke about 2 weeks ago. I didn't have any earphones after that until yesterday. I bought these Sony MDR-E9LP headphones cheaply from local supermarket. I have always loved the in-ear headpnose, because of their noise isolating system. I was thinking how could I get even something like that to these normal headphones when I realized that maybe the in-ear earphones earbud part could help. I luckily had couple of them lying on table.
Things you will need.
In-ear headphone earbuds
And of course brain will help.
Step 2: Cutting
I didn't remember to take pictures of this part but i think that evereone can do this.