This is how I 'fixed' a pair of headphones.
Materials and Tools:
1.Pair of broken headphones.
3.Fingernail File/Flat Head Screwdriver
5.(depending on the size of the speakers)something soft to fill in the extra space around the speakers.
P.S. Sorry for the not so good photos...
Step 1: Pry Open
Pry the headphones open with the fingernail file or flat head screwdriver. I used the nail file because its thin.
There is a little notch in mine and that's where I put the nail file.
Get rid of what ever is inside,you won't need it.
Step 2: Put in the New Ear Buds/speakers
First, put in the soft stuff to take up the little bit of space that will probably be left over.
(I used toilet paper because I couldn't think of anything else,and because that's all I had.)
Then put the speaker in on top of it.
Step 3: Put the Case Back On.
Put the out case back on. Then plug in and be happy. :D