Hoping someone can point me to a place that actually has replacement knobs for my TC Electronic RH450. TC Electronics website is trash. No phone number, no real email. You have to do the form email thing, then they send you an email that looks like it's bot generated saying 'supply chain, blah, blah', the part number, and a link to service centers. When you call them, they're generally less than helpful. They take your info and say they'll contact TC, maybe they'll have better luck than I did. But right now, I'm looking for other options.