Passenger kick panel vent knob removal

I've searched the internet, and this forum! I've got the pass kick panel loose but i can't get the vent knob off so i can't remove panel from the car. It's a 67 gto . I've tried pulling with a claw hammer, unscrewing it, pusging it in and turning it counterclockwise. It won't budge. If anyone can help i would be thankful!

LET