I have a local machine shop that makes my brass knobs, but they get to my work ... just whenever suits them, which of course I understand. So, my next tool purchase will be a mini metal lathe; I started researching them today. In my course of making cameras, I have tried to outsource stuff, but it has never worked out, from ground glass to bellows to brasswork.
I am lucky enough to have the use of a CNC drill/router and a laser cutter at work. When making things at home though, I prefer to use hand tools instead of power tools. I am also a guitarist and I don't want to lose any fingers.!
Have any of you ever tried "TechShop" ? I just learned about them at the Maker Fair last weekend. You buy a membership and then have access to a variety of CNC machines, lathes, mills, wood and metal. Membership is not exactly cheap for long memberships, but it was only $99 for a month. If you had all your ducks in a row, I would imagine you could knock out rather sophisticated parts for a camera in a month. Just imagine, a custom titanium bed & hardware for your DIY field camera.