Wanted - 6 Degree Taper Mill-cutter For Ball Joints

[knighty]

I am searching for a cutter that can be fitted to a bridgeport type of vertical mill that can cut 6 degree tapered holes in a plate for inserting a ball joint into, the holes must be 12mm deep, and 14mm minimum OD at the top - so a 10mm shank cutter will NOT do the job!........when I say 6 degrees this is the full inclusive angle, half angle is therefore 3 degrees. I have had both a ball joint and existing housing measured at work in an engineering grade inspection department on some pretty 5hit hot gear (CMM and shadow graph), and both measure 5.8 degrees bang on, but I'm assuming only 6 degree cutters will be available???......the ball joints in question are from VW beetle steering rack tie rods.......can anyone point me in the right direction regarding where to get one?......a UK source would be preferable, but anywhere will do I suppose!