Park Tool TNS-1 A-Head mounting tool

The threadless nut setter is used to mount star flange nuts found on threadless control set systems. The nut is screwed onto the TNS-1, inserted into the fork stack and driven in with a hammer. Set the star flange nut to 15mm and hold it straight. The long handle prevents pinching fingers.

The TNS-1 is suitable for 1" and 1-1/8" headset systems.