Not taking credit for this, but a little googling revealed someone who did it:
If you have the parts, here is the link These guys also sell the switch, and the repair manual for $50, can't vouch for them, never used them.
Good luck
EDIT: Oh, didn't see you ordered the part, give the 1st link a try. I found that and other by searching for: ibook reed switch, so you might find a better one.