Originally Posted by drac_vamp
someone on here had it done, by bernie mickelsen frame builder extraordinaire. they used existing forks, had him replace the steerer tube. good as new i believe.
dukoshoka had it done I believe.
Bernie switched it out because threadless steerer tubes have thinner walls. Threaded steerer tubes are thicker. The torque/force/pressure/whatever is difference on a threadless vs. threaded set-up.
Enough so that Bernie deemed it necessary to hack off that steerer tube (on a Soma Rush) and replace it with thicker tubing and an already threaded steere tube to match and welded it all together. It was maybe 20 minutes of work and only $50 or so?