So why do you need a metal brush? There were a lot of mysterious places in UAZ where I was 100% sure it was a factory casting, and the details were unclear. Well, or someone carefully cooked them so as not to collapse. So, thanks to this brush, I discovered that it was just centuries-old fossilized dirt, which cannot be distinguished from the native design. Assembly / disassembly of mechanisms and understanding the work of the design became much easier with this brush.