Originally Posted by Grand Bois

My VAR lockring pliers are of no use on a 3-notch ring

Originally Posted by JohnDThompson

Pliers only work on lockrings with an even number of notches. For a 3-notch ring like this, you need a hook spanner. The Hozan lockring tool is a double-ended hook spanner; the large radius end fits bottom bracket lockrings, while the smaller radius end fits these headset lockrings.