What the thread found

• Set screws alone are insufficient to secure the F-bracket to the arm post, as they can loosen during use and cause the entire rig and camera to fall
• A metal collar bolted onto the post provides additional backup security beyond set screws
• Applying threadlocker compound to set screws and regularly checking them improves reliability
• Drilling partway through the post and using set screws with threadlocker is an effective reinforcement method
• A second docking collar enables proper low-mode operation without requiring awkward repositioning or inverting the camera for docking
• Inverting the camera for docking in low-mode without a second collar creates difficulties for camera assistants during reload
• Some operators dock by flipping the entire rig and using the single collar, though this is less convenient than having a dedicated low-mode collar

Depends on

• Discussion references older Masters Film and Ultimate/Ultra rig models from the 1990s-2000s, current designs may differ
• Most experience cited is anecdotal from individual operators
• One equipment failure mentioned occurred at highway speeds, which may not represent typical operating conditions
• Docking collar availability and pricing varied by region and time period

Parts

Docking Ring, Low Mode, Arm Post

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