Heres a tutorial i made on how to take apart a transformer.
Hope it helps you out. Dont forget to check the description for further parts.
Oh and please don't complain about the quality or lack of production values, im working with very basic equipment and cant afford expensive hardware to shoot these videos with yet.
They'll get better in the future, but for now i hope this helps.http://www.youtube.com/watch?v=HW96OzEmvC8