Having spent a bit of time knocking up a sled for making box joints with my shiny new 8" Freud dado cutters I then realised that the cutters don't go on to the spindle of the saw. Only the first 4mm or so is at 30mm bore, the thread then drops down to about 15mm diameter. Any one out there with some experience of either these saws or using dados? I guess you need some sort of spacer like the kind of thing you might find on a spindle moulder for raising the cutting block, but that's 30mm exactly? I'm a bit mistified.