Step 1: Materials
Step 2: Figure out which earbud will be the microphone
Step 3: Cut Away The Pointless Bud
BE VERY CAREFUL AT THIS STAGE, ACCIDENTLY CUT THE WRONG BUD OFF AND YOU HAVE TO START ALL OVER WITH A DIFFERENT SET OF HEADPHONES!!!
Step 4: Paper (or Tube)
With a tube just slide the jack down and glue the bud in place so it doesnt slide when pulled