Got Lucky
Hey Paul. I got kind of lucky I think. I cut down my new knob and grinded it to get it to just touch what's left of the broke-off knob bolt up in there. Then I built-up that knob with some tape to get it to grab at the dash hole for extra support. Then things got weird and lucky. That old knob must have broke off deep enough that I was able to grab about a thread and a half and that damn thing seems to be locked on pretty tight. If it rattles loose, which is a good possibility I think I will go with that JB Weld you are recommending and then see if I can get that thing to grab again with the glue in place. Even my little duck tape job at the dash holds the thing pretty tight. It is a damn good first try anyway. I will update you on how it holds. This really takes the pressure off me for a while. No more worrying about how terrible tackling the knob / windshield issue would be. That project can wait until my kids are out of the house or I retire some day. Thanks Man!