wrote:
I'm a new owner of a 1984 DG-300 with 700 hrs. Upon first assembly,
it is apparent there is approximately 1/8" gap between the wing root
and fuse. Also there is what appears to be a moderate amount of
movement of the wings fore/aft when moderate force is applied. What is
the acceptable amount of movement? Is there an adjustment, or shim
placement that could be expected?? I'll could feel "bumping" of the
wings in turbulent air. thanks...


There should be essentially no fore/aft movement of the wings. First
and most importantly, look at the two brass bushings in each spar end to
make sure they are not obviously worn or distorted. The bushings can be
replaced, if needed. If that is not the problem, get some shim washers
for the drag pins (your local DG rep will have them in the right size).
Stand near the fuselage and have someone move each tip fore/aft, it
should be obvious where the shim(s) need to go (at least it was to me).
Pull the wings out, slip the shims on for a trial fitting, push in and
pin the wings, and try again. If you need more than one shim on a drag
pin, try to evenly distribute them on both sides of the fuselage. When
it is set up to you liking, you can use a small amount RTV sealant to
glue the shims on semi-permanently. Remember, though, if it is winter
where you are, the fit will be noticeably tighter when the weather gets
warmer. So, leave a bit of slop now, if you don't want to be tearing
your hair out come summer...

Marc