Disclosed is a mechanism, method and apparatus for providing cryptographic key management. The annular electrodes form an anode and a cathode. The power supplies of the indirectly heated cathode ion source are controlled to minimize the error value, thus maintaining a substantially constant extraction current. Some subpixel jitter is acceptable, but the overall pixel rate remains exact and consistent. The second taper angle is different than the first taper angle such that an interference fit between the shank and the inner surface of the adapter sleeve forces the outer surface of the adapter sleeve into positive contact with a tapered bore of a spindle of the rotary tapered tool holder.