What the thread found

• The dovetail plate locking mechanism can loosen during normal use of tilting the rig, causing the plate to slip downward despite appearing locked.
• Tightening the flat head screw on the latch can resolve the slipping issue.
• The large screw inside the locking mechanism can gradually unscrew itself through repeated locking and unlocking cycles.
• Applying removable threadlocker compound to the main locking screw prevents it from gradually loosening during use.
• Installing shims between the locking mechanism and dovetail plate can increase clamping force and create a more secure lock.

Depends on

• The issue occurred with a specific camera setup including an Alexa and Zeiss Ultra Prime lens, though the setup was within the rig's weight rating.
• Multiple solutions were reported but it is unclear if all address the same root cause or if different Archer 2 units have different mechanical tolerances.
• The shim solution required contacting the manufacturer to obtain the correct thickness.

Parts

Dovetail Plate, Top Stage

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