Originally Posted by
az2008
I think the bars are a softer/thinner metal than the steerer tube the stem should clamp onto. You'd naturally think the handlebar riser takes just as much stress at that location as a steerer tube does. But, I believe it's the tube extending above that proposed cutoff point which contributes to the strength of the tube *at* that proposed cutoff point...
A valid point however the stem can be strengthened by making an insert from tubing or making a plug (I've used blocks of aluminum, delrin, nylon and even hardwood to make plugs that would keep tubing from collapsing). Either method has worked admirably.