Ditto! Read the instructions until you UNDERSTAND what they are saying.

Here's an example of what I mean:

A friend once phoned me because he didn't understand something. The instructions said "Place the Trailing Edge so that the 1/8" notch is towards the center."

He said "The trailing edge is FULL of notches, there's one for every rib!"

I told him to check if the notch on one end was a different size than the others. Sure enough, all of the notches were 3/32" except one, which was 1/8". It was only 1/32" larger than the others, and not easy to spot unless you were LOOKING for it.