Right after you swapped a flex..you got the vibration. The vibration you describe ...is it there at idle?
I think I took this vid with the car still on jackstands. The camera didn't do the reality of the vibration justice.
What happened when I had removed and put the flex back on was that I started all the bolts with my fingers a couple of threads. Then I zipped them in with a baby airgun. (ball less). The flex was actually 180* off.
I marked the flex and crank.
And upon repositioning .. found I could also line up the holes 180 from where it was
The one bolt is only off from the rest by a little bit. It is possible to get the flex bolted up with it 180 off. Which is why I now put those bolts in completely by hand.
