Loose Focus Knob-BCAM SD

My focus knob is loose on my BCAM SD. I can actually see the screws behind the focus knob but I can’t gain access to the screws unless the focus knob is removed. Has anyone had this problem. I’m trying to keep from sending this in to FLIR for something that seems to be simple if I could just remove the focus knob. I’ve called the customer service number but they were closed for the day.