Battery holder's plastic separators

Hi!

Disclaimer: this is the very first robotics-related project for me, so I may not use the correct terms for things, but I will try my best to explain.

I looked at all available videos related to the battery holder bit assembly, and didn't see these separators (highlighted in blue) in the battery holder. They prevent me from applying enough force to push the rivets into the first and fourth hole from the left. In fact, I'm not entirely sure the rivets fit through these holes. So, two questions:

1. Should I just break and tear these separators out?

2. Should I try to force the rivets through with a hammer or should pushing hard with my fingers be enough after I remove the separators?

Thanks!