Shunosaurus tail club pencil sketch

Pencil sketch of the enigmatic tail "club" of Shunosaurus - formed by the somewhat swollen, globular distalmost caudal vertebrae & (possibly) some spike-like osteoderms. Frustratingly little has been documented on this feature, either in text, illustration or photo. I posted a thread on Twitter expressing why I think there needs to be a scientific, published review of sauropod tail clubs - which taxa have them, their respective morphologies, and hypothesized functions. Check it out:
https://x.com/paleobyliam/status/1973891525085180376