Re: Needle Valve johnson RD-18 Home › Forum › Ask A Member › Needle Valve johnson RD-18 › Re: Needle Valve johnson RD-18 opposedtwinUS Member - 2 YearsReplies: 968Topics: 259 June 29, 2018 at 9:02 pm #78688 Those weren’t threads, those are wear marks. That needle is toast!!