Originally Posted by
Cannondaler
The Voodoo involved with re-assembling it involves a human skull, fresh dirt from a graveyard and cutting the head from a live chicken while dancing naked around a bonfire built from old tubular tires.
That being said, I once succesfully rebuilt a Deore XT 9 speed rapid fire shifter. A lot of luck and an extra pair of hands were involved so you might be able to find some online accounts of successful techniques.