help with step 2A lol

[Cassp0nk]

not got very far!!!

I'm trying to do step 2a and the white plastic rings that push onto the gear don't want to fit in the orientation shown in the diagram? It will fit with stepped edge bit on the inside?

Do I need to dremel out the white ring a bit, just try and force it or what?

There is also a molding tab on the edge of the white plastic rings. Do they need removing?

thanks! bit scared of forcing something and breaking it!