abraxas,
I did a quick google search on that trainer and I came up with a few pictures of this trainer, unfortunately it was difficult to tell from the pictures exactly how the wing is attached. But, in you post you mentioned that there are nylon screws to attach the rear of the wing to the fuselage, so I'm going to use that as a reference. Normally, in wings that have screws to attach the rear of the wing the front of the wing is attached directly to the airframe in some manner. In most cases there is a dowel rod extending from the front of the wing, in the center point of the wing, that is inserted in a hole in the former located at the front of the wing saddle on the fuselage. Sometimes it is two dowels instead of one, but that is usually how it works. You insert the dowel of the wing into the hole in the former and then push the wing as far forward as it will go, then you use the nylon screws to bolt down the wing into position. This will hold the wing in place while you fly.

Ken