Help Please!

Well I explored further than we should have with me and my brother in a multiplayer game however I dropped down the hole to the right in the main chamber with the beholder managed to get through the ghoul town, beholder area and solve the problem with the diseased ones and the guardian. I have both pieces of the rod and dont know exactly what to do next. We cant put the two pieces together and the door back into the sewers cant be opened and I dont know how to open it. I didnt do this part in my one player game as I didnt notice the drop. Can anyone help?

Kurtz,

Spoilers (of course)
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Go all the way to the right (east) of the map (gauths beholders) after you have been into the 'nipple' room upon coming out the unseen eye will be waiting. I think that the rod self connects and you have to use it (quick item slot) on the unseen eye. I could tell you more but that's all you NEED to know. - Curdis.