What the thread found

• A docking collar can slip down a post over time under camera weight even when measured dimensions suggest the fit should be adequate.
• Different collar variants from the same manufacturer may have inconsistent tolerances, making some units tighter or looser than others.
• A split collar design with two independent screws on each side can provide more even clamping pressure than a single-hinge design.
• Roughening the post surface with sandpaper can improve collar grip by increasing friction.
• A collar with a stop pin can serve as a safety mechanism to prevent the locking ring from shifting.
• Older split collar designs with dual screws may offer better holding performance than newer hinged variants.

Depends on

• This issue was specific to a particular user's setup with an XCS post and Jerry Hill Balancing Bracket combination.
• The solution involved obtaining a different collar model rather than a universal fix for the existing collar.
• The sandpaper roughening approach was suggested but not confirmed as solving the original problem.
• No testing was done to verify whether baby oil contamination actually contributed to the slipping.

Parts

Docking Ring

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