Hi - just found this via Google. Many thanks for sharing, it was a great read.
Please can I comment on your micrometer use? I see a couple of instances of you saying the part is "spot on" size-wise, yet the mic must be screwed down far too tightly to be able to maintain its position in the photos. At the correct setting the mic would easily fall/swing to the table when released from your hand. Or maybe I am wrong?
I only ask as the way I was advised to use a mic, it would never stay in situ as it does in your pics.
Thanks.