Changing scale of in-game object, including collision?

[Fredas]

Time for me to tackle this once and for all.  I have a custom in-game object which needs to be resized.  Any attempt to do so produces odd results when it comes to the in-game physics, doubtless because both the object's mesh and the collision mesh are already offset from center, and NifSkope already handles Skyrim collision meshes very badly (showing them as much too small, for example).

 

That's all I'm after.  The how-to for resizing a Skyrim object that has a collision mesh.  I'll incidentally note that any guide which involves deleting and rebuilding the existing collision mesh is effectively useless to me. :/