Oh man! I did this when I replaced the housing a while back! That spring is a real pain in da arse to get back on! If I remember correctly, I used a screwdriver to stretch it back over to the hole, but I also remember a lot of blood from my thumb too! Maybe someone else has pics or a "how-to" because for the life of me, I can't seem to remember exactly what I did! I think its been blocked from my memory forever!!!
Good luck!
Good luck!