Having issues welding another BasePart to a bone

Right now, I am using this character which was made on Blender. I was trying to attach it some hitboxes, however, this proves to be harder given the animation is from the bones. So, I was trying to weld it. I cam across this post which offers a method to do it:

However, though this works with some meshes, it is not working with my rig. Any help is appreciated!

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