The Dewalt 621 Router is a great tool, but it comes with this poorly designed stop that uses screws with locking nuts. This part replaces the OEM stop with wide fixed steps of 1/8" allowing you to set your depth and then quickly take multiple passes easily for deeper cuts.
Let me know if you print one or find it useful. I think it's a great upgrade to a good tool. My Larger Bosch router has one that inspired this upgrade. I shared a drawing of the part so you can make one with different stop depths if you so desire.