How do I make an elbow lock with Rigify?

With Rigify, how do I make a character rest its elbow on a table (pinned) and keep it there while moving the torso or the wrist? Also known as an elbow lock.

If Rigify can’t do such a thing, can I set up some bone restraints make my own elbow lock?

This is available as a feature set now: Rigify pinning knee elbow.

Example file (link from the GitHub notes in the linked thread above).

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My comment is in Blend Swap. :wink: