Deke,
Forster does one for their 'case trimmer system'. I got one of the trimmers off of ebay, and it's a lovely tool, basically a mini-lathe, www.forsterproducts.com . Once I find a friendly machinist, lots of the attachments, pilots, etc are pretty basic, and given half a chance, I reckin I could do most of them myself.
Cheers,
R*2