NB: there is a height limit mark on the stem, do not raise it above that mark.
head set top nut has nothing to do with stem height ,
it is the lock nut that keeps the headset from going out of adjustment.
If you messed with it, you need 2 wrenches , one of them a specifically
made headset wrench to do it up right, again.
Last edited by fietsbob; 03-30-12 at 11:35 PM.