Hello AC-Web users. Has anyone done any spell editing before or has knowlege how edit spell or look into it?

I'm wanting to 'fix' or find a animation what spell Bone Guitar has (Spell ID: 163123 Added in patch 6.0.1.18297) To add it spell Guitar (Spell ID: 243196 Added in patch 7.2.5.23910)

I need it since i am planing to script Blight Boar event and Cage Head + Jon Graves has that guitar and they playing undead dance animation what focus on that guitar playing.