In article wFIcf.558482$xm3.71727@attbi_s21, JWho says...

Stem hole for *what*, the fork tube or for the steering head
tube?

It is commonly called the "stem". It is the up and down metal rod in this
pictu

http://www.husaberg.se/EN/images/6426.jpg

OK, that's the steering head tube, or steering stem. You need to
be able to load up the tapered roller bearings in the headset so
there is typically a race and locknut involved somewhere there,
either above or below the upper triple clamp. You need to be sure
that your design does not allow the preload to come off those
bearings if it fails somehow, and that your modification does not
introduce any additional free play between the triple clamp and the
stem, which could cause steering instability or headshake.

Jim


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