Dado blade in a track saw. | Yep thats what it looks like a spindle moulder cutter block in a track saw! This isn't a hack. Basically this is the HK85 saw,
Cutting dadoes with a circular saw
DD208H | Saw Blades | Wood Cutting | Dado
Skarpaz 8" 24 Teeth Industrial Dado Set Circular Saw Blade
8 in. x 24-Tooth Stacked Dado Saw Blade Set Durable Carbide Blades Clean Cut | eBay