Answer:
I'm not really more than holes tied to more holes. I'm strong as good steel, though not as stiff as a pole.
Hold the tail, while I fish for you.
What types of words are these: madam, civic, eye, level?
Large as a mountain, small as a pea, Endlessly swimming in a water-less sea.
What looks back but cannot see?
You use it between your head and your toes, the more it works the thinner it grows.