I read that before I bought my last HF blades, too. Useless. Bosch does have a disk that fits over the blade mandrel to make it more or less flat (small bumps, intended to grip the blade apparently). Using that, anything, sorta, fits but it doesn't hold the blade well and there is nothing to really center the blade. I ended up using it yesterday because the new Dremel blades don't fit the Bosch, either.