I am far more used to fixing road bikes and MTB's of all flavours. BMX's are something I have never had.
I have one to rebuild. It came incomplete. The bit I am not sure on is the insert pictured below that has to go inside the head tube. The steerertube fits though this. The thing that I don't get is there is a cable hole in this insert. Is this some kind of detangler or does it have another function? It does have a sliding collar. Should the rear brake cable for V's pass though the holes in this insert and if so then should the cable pass then through the smaller lower hole in the frame. I always thought detanglers took split cables and sat on the outside. What is the big hole in the frame (pictured) for? This one has me a bit confused.
Here are some pics. I hope someone can shine some light on this. No idea what the frame is.
I have one to rebuild. It came incomplete. The bit I am not sure on is the insert pictured below that has to go inside the head tube. The steerertube fits though this. The thing that I don't get is there is a cable hole in this insert. Is this some kind of detangler or does it have another function? It does have a sliding collar. Should the rear brake cable for V's pass though the holes in this insert and if so then should the cable pass then through the smaller lower hole in the frame. I always thought detanglers took split cables and sat on the outside. What is the big hole in the frame (pictured) for? This one has me a bit confused.
Here are some pics. I hope someone can shine some light on this. No idea what the frame is.



