Quote - Question regarding the JCM get lost when Bone center changes?
Why is that exactly? Does the body part move to a different position so that the sculpted JCM no longer fits the new position?

Yep, that's what I meant. As long as the body part doesn't move around, I can just reload my sculpted mesh and thus compute the new deltas to go with the modified JPs.

Come to think of it, even if the body part moves around, I could probably still apply the existing deltas, export the result and sculpt away any problems that might have turned up. I haven't tried that in praxis yet, but I imagine it might still be less work in many cases than redoing the whole JCM from scratch.

-- I'm not mad at you, just Westphalian.