The business of forming pipes with curves typically involves mandrels. A mandrel, in this case, is a solid body that prevents the pipe from deforming in undesir

The business of forming pipes with curves typically involves mandrels. A mandrel, in this case, is a solid body that prevents the pipe from deforming in undesirable ways. https://en.wikipedia.org/wiki/Mandrel https://en.wikipedia.org/wiki/Mandrel Musical instrument repair is clearly more complex than this—it's a skilled, improvisational profession that would probably welcome this kind of trick. I feel that, outside of Mega City One, those specialists just would not exist, their skills wouldn't be sustainable as a source of employment. That's the economic side of this—it's cool to come up with new techniques for instrument repair, but try being an instrument repairer in a city on the periphery. It's scary that this kind of (fairly mild) specialization is so precarious.