What do you mean by “bad condition” , flybacks are the very epitome of “you can't judge a book by its cover” IE, just cause it looks awful, does not mean that it's bad, as many have pointed out here, but if it is arcing all over the place, there are ways to deal with it like removing the failed parts of the rubber “doughnut” that often carbon tracks, and using NON-VINEGAR type silicone, or my choice, High Voltage Super Corona Dope.
But always 1st rule is, if it's not broken, don't fix it!
