I have attached 3 files which explain my recent experience with a brand new Freud dado set. Please read to the end as this post is not a negative about Freud but rather what I experienced using the Freud on my equipment!
Glad it helped, I am not sure how I will permanently fix my saw as I don't want to have to redo the metal tape each time I setup to use the dado set. At one time, I was told you could buy new arbors with extended shoulders but this old Delta dates back pre 1970 (actually one of my first pieces of woodworking machinery, she has been with me all of my woodworking life, been rebuilt twice with bearings and belts, but she still purrs like a kitten!)Wow, this is a really timely post for me- I was literally using my Freud dado set for the first time yesterday and noticing a ridge on the arbor side of my 3/4" dado stack. I'm just going to smooth it out on this project, but I'll have to keep this in mind for the next time I use it.