Cutting valve stems for Beehive/conical springs

For those who want to cut their own valve tips for the taller Beehive or Conical springs. You need to use ceramic cutting bits on hardened Steve Maney or Black diamond valves. Regular bits may work for Stainless steel valves but even carbide dulls quickly against the hardened valve stems. Use a .015" radiused tip (such as 221) or .008" radiused tip if you can find it (such as 2205). It took me awhile to figure this out so I'm passing it on to those who want to do their own machining and some some $.