My dado set will go to 3/4". My arbor though will not let me go that large and use the outside washer that goes between the outer blade and the arbor nut. Is it safe to use it that way or should I not omit the washer and make 3/4" dado's on two passes? Could I use a regular grade 8 5/8" washer that would be thinner than the one that came with the saw?

Thanks

George