Originally Posted by
TLCFORBIKES
I have converted threaded headsets (mostly Shimano DuraAce) by grinding the lower threaded part of the headset (using a dremel tool) at a angle deep enough for a centering wedge to fit inside the headset. Then you can put spacers on followed by your stem. You will need spacers , a centering wedge , star nut w/top cap & screw or compressor.
The only other time for this conversion I'm aware of was years ago by pro team mechanics whose teams were sponsored by Shimano. They wanted to use threadless forks and stems so they modified Shimano threaded headsets as you describe but only to keep their sponsor happy.
Shimano did not and still doesn't make threadless headsets. In fact, I don't think Shimano makes any headsets of any type these days.
Originally Posted by
TLCFORBIKES
My choice is to remove old headset (probably not in the best shape after 10+ years) pop in a new headset and rock on.
+ A bunch!