What attachment did you use for the thread polishing? I have a Dremel with like 200 different attachments. That has been my issue the whole time with the rba, it's not the building (that's become easy!) it's that the threading is TERRIBLE!!!
I've found that a horizontal coil is FAR easier for me to install that a vertical coil on the VVWTF! After several failed attempts, tool throwing, and a lot of swearing I found that installing the bottom lead in first made it a complete breeze to set up. I was following the You Tube tutorial when I first got it and he is securing the top lead first so I tried to emulate that and all I got for it was heartbreak and regret! Once I started installing the bottom lead first it's been easy peasy ever since!
Alas, this last attempt at building the VVWTF was my last. After a couple of hours of frustration, I pulled down my trusty war-hammer off the wall and smote the offending deck....thrice. It is no more. And I shan't be tempted to try again now. All is well in the multi-verse.