Originally Posted by
Steev
I would not attempt this or have anyone else attempt it.
A fork designed to be threadless is very unlikely to have the wall thickness to support cutting a thread into it. The steerer may shear off either during threading or in service.
It will also be very difficult to cut such a large and deep thread by hand and obtain satisfactory results.
The die linked above is intended for chasing or maybe extending the existing threading on a fork. I doubt you could cut a full thread without dulling the die to uselessness.
A very good point in this posting. The wall thickness of a threadless fork may not be sufficient to allow cutting threads with adequate safety. Also, check to be sure that the steerer has the correct ID to fit and support a quill stem before you do anything else.
Where do you get the idea that the Hozan die is only intended for chasing the existing threads only?
The Hozan die can be used to
extend existing threads, not just chase them, but starting from scratch with a completely unthreaded steerer is difficult. Most bike shop, even those with appropriate tools, won't attempt it.