Lou,
What speed were you using your Dremel at to cause all that destruction? I'm keeping mine at 1 right now, and I lay the razor flat on a piece of wood to support the edge. Then I try to let the wheel rotate away from the edge as much as possible.
Ilija,
Could you describe a little more fully how you use the flap wheels? How do you hold the blade, how much of the wheel is in contact with the blade, etc.
Thanks,
Josh