I posted an article about Whitby rudder installation, repair and maintenance containing scans of the factory instructions. Stuffing box concerns as well as mention of interior construction are mentioned.
Doug Stephenson emailed me the scans too many months ago. Thanks to Doug for sharing this info with us.
Go to: Home > Maintenance, Repairs, Upgrades & Additions > Steering Systems and Bow Thrusters > Whitby Boat Works Rudder Installation and Repair Instructions