It is as Brian says I am sure. If you make a sleeve you only need one, then all int 30 stuff will fit, new stuff is not expensive from our sponsors. Can you send a pic of that one tool that you have with the ns taper, I would not carve that up. If you make a sleeve and mess up you can easily have another go, it can be a little tricky to get the diameters right, a little bit changes to lengh quite a lot, if you see what I mean,