this is how to teardown an iPod shuffle 2nd gen. Enjoy it...
Step 1: Step 1: Get an IPod That You Don't Want
Step 2: Step 2: Take Off the Top White Cover, With a Knife or Needle
carefully remove the plastic white TOP covering on ipod, the side with the hole
Step 3: Step 3: Take Off the Metal Covering
unscrew the two screws and remove the steel cover carefully.
Step 4: Step 4: Slip the Guts Out
using the knife unclip the small metal clip and slide the "ipod" out of the casing.
Step 5: Enjoy the Guts
try to actually use the iPod this way, see the difference without the case?