"Wilmots explains on his website why he actually bought that specific Felder model was because it was one of the only options at the time able to use a dado blade set. If you happen to look closely on some of his videos you'll see that the arbor actually has two extra pins which prevent the blade loosening the arbor nut when the blade stops. This is how the European saws get away with dado blades. I know that Hammer (Felder lower end line)  also has this option on a machine."