Animation: Replace Avatar after model deletion

Hi,

So I had a model and saved a few animations against said model. I then deleted that model and the animations went to "ModelHolder: Position (Missing!)". The Animator Avatar is set to "None (Avatar)". For some reason I can't simply drag-and-drop my new model into that slot.

How do I load my saved animations onto a new model?

For the avoidance of doubt the models are identical - only the game object name has changed in the hierarchy (in fact, and if relevant, the original model was a child of a child of the game object; I deleted one child so that the new model is a child of the game object).

Thanks,
A