Leaking Overflow Bulkhead

[clowny]

I purchased a tank about 1 year ago and have finally ordered all the parts and supplies to get it going. As I was filling the tank I found a massive leak between the glass and the bulk head in the Overflow. I tried to tighten but as I turned the nut the whole bulkhead turned with it. Now the problem is I cannot move the nut without moving the whole bulk head. Problem 2 is the nut is in the overflow. How do i fix/remove this bulk head???? to make sure this leak is settled before the wife kills me and the hard wood is ruined?! Picture added. the 1.5 inch bulk head is the leaking one (big one).