http://home.insightbb.com/~richnjane1/table1.htm

If you check out the link above, you will see a picture of a dutch
drawleaf-dining room table that I designed and built for my son two years
ago. The table is made of white oak and finished with catalyzed lacquer. The
top is 30mm thick (one inch and change) and the extension leaves store under
the top on the ends and can be pulled out and popped up to add 18 inches on
each end of the table. I made the top and the leaves as one single glue-up
with the grain running the length of the table. Since I used clips in
grooves in the apron, the main top has stayed nice and flat, but as you may
have guessed by now, the leaves have warped and now the outside edges droop
(about 1/4" to 3/8") and the extension is no longer flat and coplaner with
the top when extended. I now realize that I should have used a breadboard
end (possibly both ends of the extensions) or something, but I was too
preoccupied with maintaining the continuous grain pattern from top to the
extensions. Now after the wordy problem description, my question is how to
fix the problem. My thought is to cut tenons on the ends and add a
breadboard end, but how do I straighten the leaves to accept the cross end
breadboard piece or is there some other remedy that I could use. Thanks in
advance for any thoughts - Rich