I may be wrong and if I am please correct me. I believe most engineering specifications are proprietary information, meaning they don’t release it to the general public. The pitch is one thing that I would be very careful about. It has a very tight tolerance and it’s not easy to get perfect results unless you have a jig and experience.
Have you considered removing the powerhead and just ship the auger to SM or D-Rock? If you ship inside of Minnesota UPS and Fed Ex both have next day deliveries for ground service. If you call ahead and send it in on a Monday there is no reason you shouldn’t get it back on Thursday or Friday. I know you mentioned that you didn’t want to hear SM or D-Rock but just thought I would mention the shipping work around. Hopefully I’m wrong about the proprietary info and you can try it yourself.