Calling me out of the blue to say "hey." Before that, you're just some guy on the internet who sent me a quote - and I've got like 50 of those to deal with right now.
Following up with an email within the hour.
Following up with another email a week later with a picture of some samples (minus the knurling, but you acknowledge that) that you made.

Now you've got my attention. And then I respond and say something about how important the feel of the knurling is to us, because the knob is really the only UI element in The Public Radio. And now we have a relationship.

So: Tru Precision Manufacturing LLC. Good stuff.