Recently I removed the 3 chrome dome style knobs from my Fender J, and noticed how heavy they were. I swear, it felt like a pound. I think they are solid brass. I've been searching the internet, but can't find the same style knob in something lighter. Does anyone know where I can get these? Heck, I'd even go chrome plated plastic if they aren't too cheaply made. I'm putting my basses on a diet.