My daughter's bike has a threaded headset, and I don't know what tool I need to adjust it. As you can see from the picture, there are the following parts in the stack:
- a knurled ring, which presumably isn't very tool-friendly
- a ring (with a diameter of 35 or 36 mm) with three notches spaced equally apart (I'm not sure whether or not this is permanently attached to the knurled ring)
- a standard six-sided nut, which I assume I can loosen and tighten with an ordinary crescent wrench
It looks like I'll need some sort of special tool for the ring with the three notches. What tool will I need for adjusting this headset?