Hi, This is my first post here. I've had a trusty Precision for the past 45 years and decided to get a nice little violin bass in my dotage as its a lot lighter. I love it, wish I'd had one years ago. However, does anyone know how to remove the knobs on an Ignition bass? I want to replace them with the white type that I think look better. There's no grubscrew and I've pulled as hard as I dare so far without success. Any advice?