Yep... all of the above. Magnets don't need to look pretty. They're either a magnet or they aren't. Unless the scratch area protrudes enough to touch something, you're good to go!
That is correct !---Only has / needs one set of magnets to make the wonderful and universal magneto work.----Magnets sweep by one coil to fire one cylinder and the at 180 degrees sweep by the oher coil to fire it.