Thank you! Yep completion should be very close
Thanks for the kind words
Those plastic things are called "cable comb" and there are basically 2 types:
One like mine, with those "U" shaped indentations. You basically push the wire in until it "clicks" and then you move the cable comb back or forward until you find the correct spot where the cables stay in a position that you like.
The second type is "O" shaped and you have to put the sleeved wire in before you connect the pin to the connectors.
I prefer the first type because is more practical in my opinion.
Lutro0 and E22 make them. I personally ordered mine from E22.
Sorry for my not-very-good english