I link one by one and stretch with trust Strong when joined yet flexible enough I can pull or carry or lock what is near What linked looped thing helps hold things here

I turn without legs and move the might of machines Toothed and tight I pass force between unseen means I spin with another yet keep things in line What small hard helper makes engines align?

Numbers or letters might be colors, dates might have physical locations. Start with Seymour, Simon or Silas, followed by where you might find bird eggs. Next is a pronoun, then finish with the singer of Chandelier.

A guide through the blue. I'm the first one you see. You'll hear me or see me while bound to your seat.

In a certain video game franchise, the undead are blocked by this shell, it may be tall, armored, or explosive, but its defense is tough to crack