I had mine sent out to TEA in Ohio and they did a great job with the CNC/milling work. Contact them for a custom quote on work...their prices arent that bad if you supply the heads and do the spring assembly yourself. Shipping was $30 and turn around was 10 business days from when I shipped them.
http://www.njfboa.org/forums/showthread.php?t=52424
^^Post 13 has the pics of the heads when I got them back