Riddle Me This

Well ladies and gentlemen, I had to try giving you some harder ones. GOOD LUCK!

1. Though I exist alone, there are often many of us interconnected like the threads of a web. If I am worn, there is an expression that indicates you should not leave me. A man with a name meaning something like 'knowledgeable one' once said that I was number four of a certain set, & had less than ten folds. What am I? ___________

2. Read backward I am someone who does not tell the truth. I am essential for the movement of a connected series of carriages. What am I? _____________

3. I am short, concise and to the point. Change my first letter and you have a body of metrical writing. What am I?

4. I am a premonition. My first five letters mean 'to make merry.' What am I?_______

5. I was well known in the heavy metal world of the 80's for yelling at Satan. My name backward is a right to hold another's property. Who am I? ______________