Step 1:
Fly Eagle Has changed the rudder servo mount.

---

Step 2:
Remove the shaded area with a saw and clean with a file.

---

Step 3:
You may have to enlarge the servo hole a small bit.

---

The servo should fit inside enough for the servo arm to clear the bottom of the vertical Fin.

---

The Vertical Fin is bolted in place inside the fuslage.