Staufenbiel Epsilon XL V3 Instructions De Montage page 26

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THE WINGS
Sand the surface of the winglets where the glue will
be applied.
Glue the winglets to the wing with CA or epoxy glue.
You can fix it with clear tape until the glue has dried
completely.
Remove the foam where the linkage for the flap will
be placed.
Widen the hole for the flap linkage with a file. This will
help to prevent mechanical blocking of the linkage.