The same line on the opposite end of the core on the opposite test plate completes the definition of the plane. Depending on how long the overhang on your test plate is, the center of that face may or may not lie on that plane.
Yes, I can open an Ansys 2020 R1 model to look at it, make sure to use File Archive and create a .wbpz file. Provide a link to that file from your Google Drive or OneDrive in your reply.
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