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Hello,
I would recommend using Connectors to define the rigid elements. That way when you update the mesh, you can re-realize the Connectors to the new mesh size.
Youtube
https://www.youtube.com/playlist?list=PLGNemB0NFb0C_SyFVrdD9d0WZEr1aUiP3
Help
https://2023.help.altair.com/2023.1/hwdesktop/hwx/topics/pre_processing/connectors/connectors.htm
Thanks