An old trick is to use a bit of rubber cement to adhere a shim to one of the blades when setting up the stack on the arbor. I have a Freud stack dado set, but haven't had the problem you describe with my Ryobi BT3000. My saw has 1/4" and 1/2" spacers next to the arbor bearing that can be removed to allow the dado set to sit more over the non-threaded portion of the arbor.
I've gone out to find myself. If I return before I get back, have me wait for me.
"Sawdust is Man Glitter"
Last edited by Jim Frye; 03-14-2017 at 06:02 PM.