Originally Posted by
the sci guy
I think my headset is loose again, as I get some play in the fork when I hold the brakes and rock it back and forth.
What do I need to fix this myself? It's a threaded headset I believe - since it's on my 84 Raleigh.
I like to use an adjustable plumber's wrench to tighten the lockring.
You will also need a special wrench (park tool makes one) that is very thin to adjust the upper bearing cup. I will look up which model it is.
After you have the wrenches, take off the lockring, take out the stem, and inspect your bearing rings and races (they should be smooth). Most likely you just have an adjustment issue. Threaded headsets are kind of finicky.
As long as your bearings are smooth and lived, screw the upper bearing race onto the fork by hand, then gently snug it with the headset wrench. Hold that wrench with one hand (so the bearing race doesn't move), then torque heavy on the lockring with your other hand. After the headset is tight, make sure it moves smoothly. If not, loosen and try again. It might take a few tries, but will definitely be easier with 2 people.
Dave