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@36x18
Can we knock this one on the head? You can fit an 1" quill to an 1'1/8th threadless steerer if you really want to.
It's not an adapter job, but that Diatech thing in Crank's post may work if still available, and it could save a load of work.
You will be doing this against the advice of many good men and women, your dentist will rub his hands and book his holidays.
You will ruin your bike and turn it into a noodle. Nobody will fancy you ever. You will be shunned. Some people say you will die.
But your bike won't have an Ahead stem and all their advantages.
You need a fork with a steel steerer. You need a threaded headset or a CK 2nut conversion.
You need a die and guide of the right size and a shim to suit, a vice that is properly mounted, cutting fluid (ahem),
a steerer cutting guide (ditto), a hacksaw, measuring kit, spacers, about two hours away from your customary loom-wrecking, and breakfast.
Cut the thread onto the steerer tube, until the threaded part sits below the top bearing, like so;
If only that sounded like it is. An hour of sweat, oil, swarf, mess and pain. No wonder no-one wants to do it.
If you have a cutting guide, a load of this work can be saved by cutting the steerer a bit nearer its likely height.
I haven't got one, and wanted the thread to start true, so did the whole length.
Mount the fork with the first nut, add some spacers, and future-proof the thing by allowing a frame change to the next size up, in case your frame is too small.
Whole weekends have been ruined by people cutting steerers too short. Don't do it, and leave lots of spare thread. You can always cut more off later.
Measure and cut allowing for the depth of the top nut. Bolt it all together with silly-big spanners, insert shim and stem. Don't forget to grease it or it will seize.
There. That's my bike ruined, and it looks like a startled praying mantis. I need a longer shim or a shorter stem. Hey ho.
Shims;
http://www.sjscycles.co.uk/stems-accessories-dept350_pg1/