Hi Ken, Nice system. I would recommend the Wilson Benesch for good value. Sophia is not a good value. If you like the sound of Sophia better, then you should go for a Watt/Puppy, new or used.
As for the knobs, I would email ML customer support directly from their website. If they don't have replacements, you can probably have the old knobs refinished locally. They have been "bead blasted", a form of sandblasting. Contact a sandblaster, or someone who does custom magnesium automobile wheels. They should be able to help you.
As for the knobs, I would email ML customer support directly from their website. If they don't have replacements, you can probably have the old knobs refinished locally. They have been "bead blasted", a form of sandblasting. Contact a sandblaster, or someone who does custom magnesium automobile wheels. They should be able to help you.