How a Horn is Made
A special section

In one corner of the factory, there is a workshop for repairing mid- to low-range brass instruments. Broken instruments from all over the country come here.
Some instruments look like they were in a car wreck. Of the instruments waiting for repair, some look like someone put their weight on the bell while it was attached, tragically crushing the tube. Others seem like they have been dropped, and still others have accumulated small dents from being bumped here and there over many years.

The craftsmen at the repair shop do their best to give new life to those instruments that can be salvaged. However, repairing instruments is even more difficult than making them, and for used instruments, once all the parts are removed, they cannot be restored to their original condition. They become misshaped in many places and no longer fit. Thus, only one part is removed, repaired, and replaced before removing the next part, and this is repeated for the entire repair.

Broken parts cannot simply be replaced. For example, a bent tuba bell will take about six hours to repair. The bent part is straightened out little by little, first long-ways and then side-ways about 10 times, after which it is polished. For all appearances, it is as good as new, but unfortunately, once a piece of metal is bent, it will not conduct vibrations as efficiently, and the timbre cannot be restored to its original state. So, it is important to take care of your instrument.

Musical instruments that are lovingly made and repaired by many people should be respected and cared for.