I finally figured it out! Thank you ddtrina, I have that pdf but read through it more thoroughly and realized the direction of the stud determines where the "+ -" land. Because the 15-91 has the tensioner on the face plate, the stud needs to be horizontal so that the "+-" are facing the sewer (me). As opposed to the tensioner that is on the front and the "+-" will land on the top.
Mickey2- the only reason I don't like that tutorial is because the front mounted one has the take up spring in a different place due to placement of the tensioner on the machine. Not that the tutorial is bad, just not what I need. There is a utube that does a 15-91 and while helpful, it did not answer my questions.
Anyway, I got it all figured out and put back together and aside from possibly ordering another take up spring I think all is well.