I haven't found any retail stores that sell parts. I had to go to an authorized repair shop and order parts from them. Usually they have to get the parts from overseas. You can find the part number you need from here. https://cs.hoshinogakki.co.jp/i-publ...es/Login00.jsp JME
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Acoustic bass fetish club # 47
Praise and Worship #900
If you can find a local warranty repair guy, he can easily order parts from them. They seem to have a good supply of older parts, including knobs etc, and they don't take all that long to get in my experience.