Just wondering what is the process to convert from a threadless 1" steerer to become 1" threaded. If I simply just replace the threadless headset with a threaded headset then I can use threaded quill stems? Or do I need to change other things. Thanks.

that and the fork has to be replaced with the corresponding type.

its just aesthetic - there are probably zero reasons i can think of that make quill stems more practical/higher in performance.

but answering your question, since aesthetics is important nonetheless
have the lbs thread your fork, and get a threaded headset

Is that possible in all cases?; if I remember correctly there was a guy who posted here about how his LBS wouldn't do that for him......

Again, most shops are willing to chase threads for you but not many will actually cut new ones for you...

More to read here.
https://www.bikeforums.net/showthread...ankin-my-chain

Threaded forks are pretty cheap and easy to be had. I got one for $35 from my shop after a collision a while back.

threading a previously unthreaded fork is a somewhat risky proposition, and one that many bike shops are unwilling to take on. Buy a new fork, or better yet, stop caring about your bikes looks and don't spend all this money on an impractical 'upgrade'

But but but but then I can't use my NJS headset and stem...