I know this question has been asked before but it seems that there has been conflicting answers in the past threads. I have a bridgeport series II interact 2there is no drawbar I have the collett that you tighten with a spanner wrench to tighten the tool holder. So which taper is it bt30, nmtb30, or erickson quick change 30? I'm a newbie to CNC so forgive me if these are all the same thing I just want to be sure to get the right holders.