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It's been awhile since I closed out the wing center section so had to take
a look at the location of the jack points to be sure... the way my closeout
ribs went it, the inboard side of them aligns with the center of the jack
points.  I don't remember whether it was the manual that recommended that
configuration or if I was smart enough to think about doing it on my own,
but in looking at that installation I have no fears at all about using the
jack points to lift the airframe.  The BIDs which back them up extend
upward onto the closeout rib and the main spar, so consequently are tied
into the load transfer pads.  There's no chance that I will ever deform the
bottom of the fuselage using them for their intended purpose.

I do agree, however, with those of you who have them situated in a spot
where they don't get the advantage of the load transfer pads, closeout
ribs, and main spar for backup, that coming up with a way to balance the
loading across the bottom of the fuse to a good solid location (ie, main
spar) is probably very prudent.   I also agree with Bob J. that considering
the ultimate purpose of the pads and not only their intermediate use as
support points during construction should be the prime motivation and
guiding light in coming up with a jacking system.

  <Marv>