Can a threaded headeset be converted to a threadless headset I just want to ask a burning question in my mind. I still ride a bike that uses threaded headsets, I was wondering if I could use the tightening cap of the headset as the base of the whole thing then use spacers and a star nut and top cap to lock everything down?

I of course have tried the adapter systems, and I do not like how it feels, so I was wondering if I could do what I said above.

Thanks guys!!

UPDATE:

My fork is relatively new and has alot of extra steerer tube because I haven't cut it down yet.

Latest update:

So I went to the bike shops around my town and got to buy a shim or whatever they call it. Also bought the star nut and top cap for the bike. I made them do it for me, and it looks quite good now.. Will be posting a pic later when I get home.
Not sure why you would attempt to use a threaded headset as a threadless headset - other than trying to save on something which you can't.

The stem and top-cap assembly of a threadless headset are integral to securing the fork into the frame. Whereas a threaded headset secures the to the fork using a large nut.

There is nothing to stop you buying retro one inch fork, threadless headset and stem. That would be the safest way to do it.