Jessica, check to be sure you have mounted the bristle brushes so that the leading edge of the wheel is the curve of the arms rather than the points. When correctly mounted they wear exceedingly well and rarely "fly off". I use them mounted 5 or 6 on a mandrel and it takes a very long time to wear them down to the hub.
Thanks Pam for the suggestion - I actually have made the mistake of
mounting them upside-down in the past, but not any more…and they
still seem to wear very quickly! At least the yellow ones (most
abrasive) do for me…I usually only mount them one at a time because
I use them most for very small work; i.e. getting excess solder out
from under a tiny hinge in a spot that’s difficult to access. Perhaps
the problem is in the fact that I’m using a Dremel multi-pro rather
than a proper flex shaft? I know that when I use a proper flex shaft
the wheels do seem to last longer and operate more effectively. Which
leads me to realize I need to seriously consider an upgrade…rats!
Anyone else had trouble making the 3M Radial Bristles last?