Reply to Numark Total Control broken knob - help please?

Hi everyone,

I managed to break one of the knobs on my Total Control. I've looked all over to see if anyone else had this problem and managed to fix it, but I couldn't find anything.

I was wondering if any of you guys have any idea how I would go about fixing it? I tried superglue - it held on for a couple of weeks, but it came off again.
I attached some images so that you guys have a better idea of what I'm dealing with.







The control itself works fine, so a solution involving glue might work. I'm also open to ideas on how to open it up and replace it, if need be.
Thanks in advance for all your help!