Rotate assembly around specified point using AlignOrientation

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#1

Hi
I have a welded assembly of the green and blue parts. I want to rotate this assembly along the center position of the green part using an AlignOrientation.

They rotate around the assembly center position when welded together. Deleting the blue part fixes it, but that’s unfortunately not an option for me.
image
image

Is there a way to rotate the parts around a specified pivot using a (body)force while still keeping them welded?
Here’s the very simple placefile:
rotation_test.rbxl (54.7 KB)

You can rotate the red part to see the assembly rotate.

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#2

Nevermind, figured it out: making the blue part Massless fixes it.

Works for my usecase atleast. I think the torque is always applied around the center of mass. So only fix is to shift the center of mass…

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#3

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