Today we’re modifying the connecting rod metal to make it the main metal.
It’s a considerably reckless process, but the connecting rod metal was the one that fit best.
We processed the oil groove inside the flat connecting rod metal. It took a good amount of time to complete as it was produced with a jig tool.
Now that we have secured the oil path, the next step is to drill the oil hole.
![](https://www.naprec.co.jp/docs/wp-content/uploads/2017/11/IMG_0892.jpg)