I recently bought this little Swiss gem and seek info such as user guides parts list. The arbor takes collets that measure 42mm long and.460" thread diameter with about 20 threads per inch .635" big end with 15 degrees taper. I followed the procedures outlined in the hsm but can't come to an accurate description of the thread size Does any one know what size this would be? I was surprised MSC only had metric end mills that have an inch shank listed in their catalog.I have an 8.5mm collet that came with the machine. Thanks for the help.