E-flite Tensor 4D ARF - Manual (Page 13)

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 3. Install the rudder control horn, making sure it is
on the opposite side of the elevator horn.
 4. Trim one of the servo arms from the elevator
servo. Cut a hole in the horizontal fuselage
support to fit your servo. The servo must rest
flush with the support. Use double-sided tape or
foam-safe CA to attach the servo to the fuselage
support. The arm faces the front of the fuselage,
and the aft edge of the servo aligns with the aft
edge of the fuselage spine support.