Japanese to English Tech/Engineering Automotive / Cars & Trucks

It's related to a car manufacturing process. Apparently, it's something that can be adjusted on the sides. There isn't much context other than that. Here's an example sentence: 材料は水平になる番木を設け万力で固定し切断する。

I found the term translated as "barrel" in an unrelated document, but I don't know if it applies here.