Thank you all for your input on this... i guess am going to have to lay it to rest and live with a threadless setup.

So much for my XTR M900 purist build.

On another note, i have a matching fork that has a short steerer ( it fits just exactly with a threaded headset). How can i extend the steerer by another say 5cm to make for a more comfortable riding posture.

I am already using a high-rise angled quill stem and have looked for a quill extender but found only steel ones and too long about 8".

do you recommend any specific aluminum quill extender that is not that long?