Assuming your Grob 102 rigs the same as the Astir CS I used to fly
(maybe it's the same model), I always rigged best with just two people.
Really very simple:

Before starting - Grease all pins, including pins on spar ends, and
*check collars are unlocked* - it's amazing how often one has been
locked accidentally, and if so you'll never rig it.

1. Slide in starboard wing, lock the collars and trestle tip.

2. Check that the end of the spar is centred vertically in the space
wher the port wing spar will go. If not, adjust by rotating fuselage
(usually best, as the leverage of raising and lowering the tip often
rotates the fueslage so the spar end is still not centred). If the
fuselage slips in the belly dolly, a third person could hold the tail in
the correct position.

3. Insert port wing until the pins on the fuselage just start to engage
(you might need to reach over and lift the trailing edge slightly), then
trestle tip to take the weight, but keep wingtip holder at tip.
Trestling is not essential here, but why lose a friend?

4. Look at starboard wing root to see where the pin on the port wing
root has to engage with a bush/olive (i.e. hole). Ask wing tip holder to
raise/lower (trestle shouldn't have been too high to permit this)/move
forward/move back until this is lined up. *If the pin/hole are not
aligned the wing will never go on*. *Do not allow some well-meaning
idiot who has never rigged a glider of this type to wiggle the wingtip*.

5. Check the fuselage/port wing root pins are still engaged - if so,
reach over the wing, lift the trailing edge a little, lift the leading
edge a little and slide it in to place. Lock off collars.

If this takes more than 5 minutes you are doing it wrong. The two key
points are (a) making sure the starboard wing spar end is central
vertically and (b) aligning the port spar end pin with the hole in the
starboard wing.




wrote:
As stated by HL, item one is an absolute! At Grob in Bluffton they have a
fuselage dolly that holds
it firmly in place to keep the fuselage from rotating after the right wing
is in place.

I assemble mine (upon rare occasion anymore since I keep it assembled in a
hangar now) by myself
with a wing holder but the most important little item turned out to be a
jack under the right wing with
very thick padding on top, under the wing about 1-2 feet from the fuselage
placed under the spar.
This keeps the fuselage from rotating when the weight of the left wing root
starts to load the fuselage
on its way in. A wing support at the tip doesn't really do the job because
of the wing flex and lets the
fuselage move sideways slightly.

Gale Winnett
Grob 102 III