"Airy R. Bean" wrote in message
...
I assumed that the lower part of the
SO239's screw thread was dirty and so drove the nut home with a
pair of pliers, assuming that this would clear the screw thread - we live
and learn!


Ho, Ho, Ho

Yet another fettling experiment that went wrong!
I'm so glad that I'm only a beginer, and not an expert like yourself...