Then Fadal and many others has done the same as well.
IMO the (40) taper does have something to do with it because when the drawbar pulls the tool tight into the spindle it seats on that taper and the drawbar is pulling on the knob of the stud.
If that length varies than the tool will not seat and be tensioned properly.
The drawbar/spindle in my Fadal will work with both BT and CAT with NO changes (as will most machines). The problem is the toolchangers and the clips are usually swappable if you wish to change styles (umbrella type anyway). You can always load the spindle by hand and not need to change anything.
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