Question About My New Butter Crock (Photo)

Factual Questions
1

I received a butter crock as a gift, and I’ve a question about how it works.

Photo of my butter Crock

I know that I fill the insert with butter and the bowl with water, but I’m confused about the purpose of the two holes on the sides of the insert. Why are they there? I don’t see them on other butter crocks I’ve looked up online.

2

It’s so the butter doesn’t get sucked out when you pull the lid out.

More on the care and feeding of butter bells (aka French butter dishes) is here.

3

So how high should I fill the insert? Should the butter not block the holes?