I'm asking this out of ignorance - is the R8 taper and the accuracy of the shank of these tools good enough to define the position of the shank in the collet repeatably? I guess it is, it's just that because there doesn't seem to be a hard stop to set how far the "adaptor" shank goes in it doesn't feel quite right to me. I need to do the CNC conversion of my mill before I start thinking about powered drawbars and things, but the price of these things does make it look a practical proposition.