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i tried running the V4 WM files against M4 and got better results than you might think. The4 main issues are at the hips and shoulders, of course, but the V4 weaight map might actually have some use as a starting place for M4 work.

Don't forget to change the joint centers. Yes I tried it on m4 a while ago and k4.

How does one go about doing that?

You need the weight mapped version and the normal version in the scene at the same time. Then FIGURE>COPY JOINT ZONES FROM....

It's still not perfect, but it was never intended either.