Today when I was going to start playing one of my knobs fell of and I can't get it back so it stays there! What should I do to get it back?

Picture of the problem:
If you can still turn that rod to adjust the tone, I would say just glue the knob back on. As long as the rest is intact.

What bass is that though (remind me never to buy one)?
John 3:16 = Truth

Sight reading tableture = Guitar Hero for real guitarists
take a screwdriver, put it in the slot and spread it out a little, it can break so be careful. That should fix it. Good luck.
fixed thanx

Jasonbts <-- it's an Esp-Ltd F155DX and it's really good, only the knobs are a bit loose and that's all I have to complain about