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IMHO, for those who are about to build their Rave, I found it easier to install the servos in the side frames (along with a little PolyZap on the keepers for future servo replacement) before the side frame assembly in step 1-1.
First, I suggest reviewing step 6-2 (for the cyclic servos) and the addendum pages 1 and 2 (for the TR servo).
After installing the servos this way, the rest of the build seems to fly together very quickly.
Keep up your rotor speed !