I need a tone control knob to replace the one that disappeared on my Peavey DynaBass. Can anyone recommend a source for this knob? I have checked and it's no longer stocked by Peavey. I love this bass. It is my first bass, I'll never part with it and would really like to get the correct knob back on there. I suppose I might be OK with buying three similar sized knobs from, for example, a more recent Peavey bass.