The locknut takes a 12mm wrench, if I remember correctly. There is a clip over the end of the pin that connects the clevis to the brake pedal. Loosen the locknut, remove the clip, push the pin out and you can turn the clevis with your fingers to make the adjustment. This makes adjusting much easier. You can just slide the pin in and check it til it's correct, then put the clip on the pin and tighten the locknut.
