E-flite Byp Yak 3D ARF - Manual (Page 19)

 3. Hinge the elevator using the supplied tape. Apply
tape to the hinge line on the top, and then deflect
the elevator up to apply the tape on the bottom.
 4. Use foam-safe CA to glue the carbon elevator
joiner to the top and bottom of the elevators.
Note: Make sure you are gluing the
joiner directly onto the foam and not onto
the hinge tape.
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