I have the 600ohm stepped type that I have been working on retooling into a diy project.
I started the earlier thread on this subject.
While I'm a Beatles fan, I am more of a 1950-1960s console fan. I personally feel that a constant impedance attenuator that is thin, and tactile has a huge place in a modern studio setting. The rotary type work great, but take up a lot of space.
The linear type are also a good option, but seem to require a little better manufacturing tolerance to get them to feel good and smooth..
And I get a little ill when I see folks dumping a classic mic pre into a 10k pot or something.
I do not intend to get rich with the venture. I just originally wanted enough for my console which I now have, but now I want more for other projects.
If you have had any luck finding help with manufacturing, I'd be interested in finding that out.
I live in a very economically depressed area full of machinist, and parts manufacturers. None of whom seem the least bit interested in taking on any work. I'm not a machinist myself, but may have to become one if I can't find help.
There is absolutely no rocket science in these things.