For those reading who haven't seen the Sig Someth'n Extra, don't get the idea the rubber bands are the support for the wing.

The SSE uses a wing support tube, running through the fuselage and into both wings.

By design, the wings are retained, on the wing tube, by a rubber band holding them next to the fuselage. Comments in this thread relate to replacement of the rubber band with some other retention device.

Best wishes,
Dave Olson