I finally broke down and bought the dado insert.  Packaging was a bit of overkill.  It arrived in a box big enough for boots!  I have used my dado blade set several times without the insert and finally ordered one.  I had ordered another tool from Amazon and added this to the list.  I actually got it for $4.00 because I ordered it when Amazon offered $25.00 off a purchase of $125.00. I would recommend adding this to your shopping list when Amazon is offering promotions.  It works great and the leveling screws work flawlessly.  I would like the insert to come with a mounting screw like the one on the regular insert that came with the saw.  It fits perfect in the slot and has a nice weight to it.  I have a Delta 36-675 with T2 fence. (Upgraded to a bigger Biesemeyer fence in mid 2006 or so.)