LBS has a thread rolling die, to make up for not having the same spoke when a touring cyclist comes in .

measurement Zero is the inside of the J hook end, to standard methods..

AFAIK, only DT Alpine is 3 gages 13 on the hook 14 on the thread end and thinner in the center.. 15 I think.

nipples break if the spoke does not fill the threaded length of it.