You could, of course, get a spare Nippy cam reground and hardened which would negate the bearing problems. There appear to be a fair few Nippy cams around, having been removed. You can even grind a decent shape into a Nippy cam without resorting to small base circles (I have one) - but Paul Bonewell knows this and has probably suggested it as an option.
Trust Paul, he's a top bloke.
Charles
Trust Paul, he's a top bloke.
Charles