I think Charlie nailed it.
Paragraph "A" says they do, paragraph "B" has nothing to contradict that, and the words before paragraph "A" tell us to do "A" and "B."
Keep in mind that "A" and "B" talk about different things. They are not different approaches to the same task. One speaks of securely fastening something. The other does not say it's OK (under certain conditions) not to securely fasten that something.
I just can't make it work out your way, Bob.