Was the CBN wheel being used wet with an antioxidant compound?
The Tormek was designed to operate with a water bath. In addition to keeping the tool being ground cool, the water bath traps all of the grinding debris. Long before Tormek introduced built in magnets in the water trough it was common practice to tape or epoxy a magnet to the outside of the water trough to isolate the ground steel.
CNN wheels have been marketed as having "the advantage" of being able to be used dry, without the fuss of having to use water. This is true, however, it is a mixed blessing. Eliminating the fuss also eliminates the benefits of the water bath. I routinely remove my grinding wheels after a sharpening session to let them dry. In the future, I will add the practice of wiping the spacer and shaft dry. I also place a plastic spacer in place of the wheel on the shaft to prevent the shaft from sliding.
Good observation, Sharpco.
Ken
ps My preference has always been to use an antioxidant compound with CBN or diamond wheels.