-The ASW-19 wing is very flexable; closing the gap fully or even almost fully will result in binding or even locked ailerons due to the flex of the wing.

- Never seen Asw-19 with a plate sealing inboard edge in any of the US based Asw-19s; had mine in red, numerous times, with substantial wings flexing....and never felt there is ANY need for any modifications to controls. Its a glider with standard certificate, so Schleicher most likely knows better what is needed or isn't.
GK