Originally Posted by
onetwentyeight
first off, do not cut threads in to a threadless steerer. The walls arent thick enough to handle it.
You would need a headset like a chris king devolution or some adaptors (problemsolvers) to downgrade the head tube from 1 1/8 to 1". Then you would need a 1" threaded fork and also headset. Thats all. Its really not worth the money and trouble.
There's plenty of 1 1/8 threaded headsets on the market. It's just a matter of finding a good looking 1 1/8 threaded fork.