I need a replacement knob for my Valiant! The "final" knob has bitten the dust. (In a bad way, the bakelite has suddenly split in several places all at once. Odd as the rest of the knobs are fine. ) Anyone out there have a replacement? If no one has an exact replacement, I would be willing to go for 2 knobs that are alike and replace the exciter knob as well. Thanks Tom Norris KA4RKT