Posted for "Brad and Tracy Simmons" <btsim1@earthlink.net>:

  There are a couple of points to add to the discussion regarding changing
the
  incidence of wings.

  Be sure and check the rigging first, as minor problems can often be
adjusted
  out...

  You shouldn't have to remove the seat bottom, as the rear spar attach point
  is accessible through the gear door...Nor have I ever found it necessary to
  remove the wings, although if the amount of movement is great enough, the
  rear spar may rub against the fillet in the "fish" area just inboard of the
joint with the wing...

  Any change greater than .3 tenths of a degree or so is going to cause a
  slightly visible misalignment between the wing and fillet...

  Consider the use of an eccentric (offset) bushing placed in the rear spar
only,
  which will not require any drilling into the gear box face, thus
eliminating
  the problem of trying to drill off-center through an existing hole. Any
  competent machine shop can make this. If the amount of movement is small,
it
  is often possible to simply drill out both holes to 1/2 " after moving the
wing to it's new location. I think this is the method we used on Jack Webb's
  IV. The wing has to be rigidly supported, as does the drill...

  If changing/setting the incidence prior to flight, Jack's measurement
method won't work.
  You must check incidence at both the tip and root. Be sure and also confirm
the relationship
between the wing and horizontal stab.  If you are  correcting a problem
found during test
flying, you may NOT be shooting for an equal measurement on both sides. My
experience is,
getting the tip measurement as close as possible is the best method.

   Brad Simmons
  Airframes Inc.
  Milan, TN