Glad to hear you got this one ironed out. Long distance trouble-shooting is tough at best.
On fitting the second stage, the best I can offer is to take your time, follow the instructions and pay strict attention to detail. If something isn't going well, doesn't seem to want to fit or whatever, stop right there, take a break and walk away from it. We all tend to believe that we are "masters of our own destiny," when, in all actuality, we are real dumb-a$$es. A short break in the action often allows us to see and realize what's wrong.
And, in the worst case, either jump back in here and ask or, as I have said before, get hold of the Wren Team.
Glad to hear you got this one sorted out, shipmate.
"There are those who have...and, those who will" IRCHA #2117, AMA #70068, Turbine Waiver #105