1970 Dart radio removal tips

Dart Radio.jpg

Hello again, I resurrected this thread because I finally have time to play with this radio. It does have AM which seems to work fine, but the FM side still has nothing. So I'm still sending it to the repairman, but my question is, is it certain that this model radio is shaft-mounted? I cannot get either knob to come off the radio, and I was really pulling on them. I don't want to break the little guys or the radio underneath, just want to make sure there's no "trick" to removing the knobs before I go all medieval on them.
My plan was to remove the shaft nuts and ashtray and try to work the radio out from underneath the dash as some suggested. Any advice? Thanks in advance