Yesterday I the 7th fuel cap this week on a piece of Stihl power equipment refused to go back on. I called the dealer and was told " we dont have problems when them where they leave the store. Only ones who do seem to be heavy handed users who cant put on a gas cap". I told them thanks and hung up. So it looks like i will be using wither ECHO or Redmax for now on. I dont get how a place that you have bought over 20K in equipment from in the last 12 months can even think of treating someone like this.