In response to your first post, I removed the black plug from the seat post and drilled that off of the bike, but the other two I drilled on the bike at about a 45° angle after stamping a Divet into them. They come off using an Allen key. I want to say it was a 4 mm. Once you get them off you will see a larger opening to fish the cables through. I put the cable in through the bottom bracket hole and pulled it out Through the whole near the head post. I had to use a small screwdriver (flat head) to catch it and kind of pry it out of the hole. It definitely took some time and a lot of patience. I had the bike upside down and on the ground through most of this process. Hope this helps and if you need  anything else, let me know. 

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