I just bought a DW680 planer. It works pretty well; certainly better than
my KMart (yes it actually says that on the label) 2".
But the directions for changing the blades seem to be for a completely
different machine. There is a large and small allen wrench, but the small
one doesn't fit anything. There is an extrusion that might be a guide, but
it doesn't fit anywhere and doesn't look like the guide in the illustration.
I contacted Dewalt, but their reply was "The allen wrench it came with is to
loosen the clamp that holds the blade so you can change the blades ." I
guess they don't know either.
And... they make carbide and steel blades for it; the steel are more
expensive. Why would I want steel? Because I can sharpen them?