Model Forum / Radio Controlled / Land Models / April 2007

It has a smaller bell diameter, a narrower bell, and a narrower shoulder
between the bearings. A standard bell would, because of the width of the
bell, not go onto the shaft far enough before the bell hit the flywheel.
If you cut the bell down to the correct size, the shoulder between the
bearings does not allow the second bearing to slide far enough down the
shaft to get the E-Clip that holds it all together on (Traxxas doesn't
use a screw in the end of the shaft). If one were to machine a CB to
make THOSE parts work, the inside of the bell would still be about 2.5mm
bigger in diameter than the Traxxas CB, so further modifications to the
clutch itself would be needed.