I've used one of these with two blades.  One is a thin kerf Freud available at HD and the other is a thick kerf DeWalt.  With the thin kerf Freud I tighten the arbor nut, turn the saw on, turn the saw off, and the blade spins on the arbor.  This is dangerous.  With the thick kerf the arbor nut stays tight but the stabilizer isn't needed with a thick kerf blade.  I'm returning this item.