With the old one take it apart and remember what bit goes were once you have removed the tiny nut, spring etc etc and clean it out with carb cleaner, and give it a generous soaking in the stuff. That will sort it. Dont do what I did when I first had this problem and use WD40, it will clogg up eventually. With the new one, cant say much without a picture or link to the ebay shop you bought it from. The Locknut in a different position doesnt sound good lol.