At a gig last night, I turned the volume knob on my Ibanez Prestige 2120z too hard and now it's loose; however, the sound is fine and it still functions properly.

The knob is unorthodox and looks like this: https://store.ibanez.com/store/Product.aspx?i=4KBX5A0002.

I've removed volume knobs on my other guitars before by simply pulling up, but I'm almost positive that the same technique does not apply here or any other variation of the use of force... It's extremely snug. I'm pretty stumped on this one. Any ideas?