(Fixed error when user attempts to upload the avatar)
Instantly create a spring ball joint on a vrchat avatar, just drag the prefab under my folder and drop it anywhere on your avatar.
You can choose to use your left hand or right, and the offset from the avatar hand bone just by clicking on the prefab and changing the settings on my script.
https://www.youtube.com/watch?v=pXT45SZBcbE&feature=youtu.be