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At least two people have expressed their opinion that the 2" jack pads are
not sufficient to support the weight of the aircraft.  I beg to differ on
this.  If the jack points are sufficiently beefed up on the inside, they are
more than adequate.  As shown in the construction manual, a piece of 1/4 x 2
x 2 phenolic is potted into the belly pan.  Probably, the 2 bid over the top
of the phenolic is not enough.  When I built my 320, I made a large flox
fillet up to the main spar and close out rib and covered that with an
additional 2 bid.  This structure is strong enough to transfer the load to
the main spar.

May I suggest to those of you who are using 2 x 4 structures etc. to support
your aircraft during construction that you need to think beyond the building
stage.  After your aircraft is flying you will periodically need to jack up
your airplane for gear retraction testing on the ground, annual inspections,
general maintenance etc..  Hopefully, you will have a jacking system that is
convenient and easy to use.

Happy Building
Bob Jude
N65BJ