When I ordered my first string from one of the popular string builders, I did not follow his string measuring instructions.
I mean, I read them, and watched the video. Thought to myself WTF there ain't no need for all that, and just took the string off the bow, and measured it.
When I sent him the order with the measurement, he instantly questioned the string length as compared to the bow length I listed, and asked if I had followed the instructions. I lied, said yes, and he didn't question me any further.
I got the string, and it was waaaaaaaaay to short, so I emailed him and told him the problem.
He said "Thought So", had me call him, and asked again if I had followed his measuring instructions. I fessed up, and said no. He just chuckled, and said go get me a good measurement (which I already had done).
The real surprise was when he built me the correct length string, and didn't charge me for it even though it was my fault the first one was wrong.
Some good folk out there for sure.
Moral of this story is, if your going to get a custom string built, follow the builders instructions, and you'll be happy from the start.