E-flite Mini Edge 3D ARF - Manual (Page 20)

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 3. View the airframe from the rear and make sure the
wing and stab are parallel. If not, lightly sand the stab
saddle until they are.
 4. Double-check the adjustments from Steps 1 through 3.
Use a felt-tipped pen to trace the outline of the fuselage
onto the top and bottom of the stabilizer.