I have a Craftsman Model 22104 and I purchased an adjustable dado blade, nothing fancy nothing to expensive. I put it on my saw but after the installment I noticed there was not much room for the washer and the nut. This dado has a 5/8 or 3/4 arbor setting, just a sleeve that fits inside the 3/4 hole for the 5/8 arbor. I just don't feel even a little safe putting it on with out the washer, yet there is only a bout 3 threads showing. Without the washer the blade turns with the nut on, it barely covers the sleeve. Are the craftsman ones thinner?