OK, now I can't stop. Details on the string idea

1) Thread a foot or so of string into the TE hole from the outside.
2) Put a wad of duct tape, sticky side out, on the end of a broom
stick and use that to fetch the end of the string from the inside of
the fuselage.
3) use a #11 Exacto knife to gently chamfer the inside of the tubing
so it will start more easily over the inside of the TE tube
4) thread the string through the tubing by taping the far end of the
tubing (non chamfered) to a vacuum cleaner and letting it suck the
string all the way through the tubing.
5) Unhook the vacuum cleaner and tie of the string to that end of the
tubing.
6) Have a helper pull the string back through the TE hole, and apply
some tension as you giggle the tube around from the inside with the
broomstick
7) Inspect your work with the family video cam, then pull the string
back through the tubing from the vacuum end.
8) Celebrate with a frosty beverage of your choice, as you bask in the
knowledge that Glider pilots are more resourceful than any other
species on the planet.

Might be worth a try. At least I know you can accomplish #8 ;-)