I can understand why it doesn't always work: the MidlineList is not valid for all figures (this one is valid for Victoria 2 and Michael 2, and will probably work on Posette, Dork and the Millenium 3 figures). It also won't work on non-English versions of Poser.

I've rewritten the script to swap all figures, independent of Poser language and body part names. See attached file. Save as SwapFigure.py.

The pen is mightier than the sword. But if you literally want to have some impact, use a typewriter

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