Hi,
I have an (oak?) extending dining table with an "I" beam between the legs at the bottom. Images can be seen at:
http://i258.photobucket.com/albums/hh256/evilprincesss/IMG_3662.jpg
Table leg support:
http://i258.photobucket.com/albums/hh256/evilprincesss/IMG_3663.jpg...