John, you are absolutely correct. I removed "MY Hidden Screw" the same way you did it. Although I had to bang with a
big hammer to get the saw blade down to touch the g^*/#/_2^ screw. No real damage.
Ron was also correct when he mentioned that I should be aware of the riggers possibly mounting wires on the aft side or the bulkhead. I had to cut a mounted wire to remove the bulkhead. What a pain. After all this trouble, there were seven additional wires blocking the removal of the tank as mentioned in previous message from Ray Irvine. My tank is going to stay put-for sure.

Dave!