Answer:
Gets rid of bad ones, short and tall. Tightens when used, one size fits all.
You can always see it, but it's too far away to touch. Mountains rest on it, and at sea it surrounds you. What is it?
A cowboy rode into Friday. He stayed in town for three days and rode back on friday. How is that possible?
They're up near the sky, on something very tall. Sometimes they die, only then do they fall.
I can sizzle like bacon, I am made with an egg. I have plenty of backbone, but lack a good leg. I peel layers like onions, but still remain whole. I can be long, like a flagpole, yet fit in a hole.
My days are numbered. What am I?