[DonRotolo]

I'll third it.
Cutting threads on any length over a few inches on very thin rod with a lathe is very tricky, and requires a follower rest and the right tooling. And, even then, without experience, the threads won't be great.

A die will produce excellent threads of the right size on significant lengths of rod at a very low expense and relatively fast speed.

Remember, you don't need the whole length threaded, do you? Just the end...

Buy the die. Trust me.