How do I get the outer shell of my Babylock Creative Pro off?

My bobbin winder won't work and I wanted to get the shell off to see if I can fix it. It stopped working after falling over in my car. I can hear something loose inside the machine. This is a mechanical machine that has 2 large knobs on the right. I have unscrewed all visible screws and I am wondering if I have to take the knobs off in order to get the plastic shell off.