Here is the general set-up for the wing hold down:

The wing root contains the adjuster socket along with two 1/4-20 nylon bolts.
The fuselage has the adjuster mechanism mounted inside, with the pin protruding from the fuselage side. There are also oversized holes for the nylon bolts to slide into the fuselage.

The adjuster pin slides into the socket in the wing root, locking the incidence in place. 1/4-20 wing nuts are threaded on the studs that protrude into the fuselage to hold the wing to the fuselage.

I don't have very good pictures of this set-up, but I have attached what I do have.

Jeff