Originally Posted by blickblocks
You can actually convert a threaded fork into a threadless fork if you really needed to. My friend did this for some reason. Doesn't really work the other way around (safely, that is). You're best off getting the right headset for your fork/stem setup though.
What is there to do to convert a threaded to a threadless fork? I would think, nothing, just mentally ignore the threads, that's it. A threaded fork will work just fine, except there will be some dirt in the threads but that won't cause any problems.