Park Tool TNS 1 Threadless Nut Setter. Installing a threadless headset's star fangled nut into your fork's steerer tube is a delightfully simple process when you've got a Park Tool Threadless Nut Setter in your tool kit. All that's required is to thread the star fangled nut onto the tool, insert into the fork's steerer tube, and tap it in with a hammer. The star fangled nut is set to the proper depth of 15mm and is kept perfectly straight, too. And because Park Tool dots every i and crosses every t, the tool's long handle is designed to prevent pinched fingers.