Hangar 9 Beast 100cc ARF - Manual (Page 40)

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 Step 3
Install the servo in the wing so the output
shaft is toward the leading edge of the wing.
Use 1/16-inch drill bit to drill pilot holes for
servo screws, then go over the holes with thin
CA. Wait until it cures before inserting the
servo in the bay and securing it.
You can use a long rod to pull the servo
extension to the wing root.