Sorry Roger but I'd have had that sorted with mait in one go.... Are you sure you haven't over tightened the backnut and split it? There are many things you can't learn from a book/YouTube video/forum.
It's a touchy-feely-tool-is-an-extension-of-your-arm/wrist/fingers-thing
It's a touchy-feely-tool-is-an-extension-of-your-arm/wrist/fingers-thing