I use this technique when tightening mine (ahem, headset that is!):
Tighten up until it feels tight (obviously not overtightening and wrecking the bearings/cups), back it off a little.
Hold front brake on and rock bike back and forth (be gentle) with hand around top cup and top of head tube.
Just keep tightening gently until you can feel no play when rocking back and forth.
If you think you may have over-tightened, back it off and start again.
This has seen me well on my MTB which is over 10 years old, never had to replace the headset.
Bike has done 1000's of miles on and off road.
(I also use this technique on car bearings after changing brake shoes, so be warned - never buy a car off me!)
I use this technique when tightening mine (ahem, headset that is!):
Tighten up until it feels tight (obviously not overtightening and wrecking the bearings/cups), back it off a little.
Hold front brake on and rock bike back and forth (be gentle) with hand around top cup and top of head tube.
Just keep tightening gently until you can feel no play when rocking back and forth.
If you think you may have over-tightened, back it off and start again.
This has seen me well on my MTB which is over 10 years old, never had to replace the headset.
Bike has done 1000's of miles on and off road.
(I also use this technique on car bearings after changing brake shoes, so be warned - never buy a car off me!)