Changes belts to be partly made of rubber instead of entirely iron.
or will it overwrite it / add additional rubber
P.S. I'm happy to see you modding for Factorio Reika
Sure, I can add that.
Argh, ninja'd! I was waiting to head home and test. It overwrites the item definitions but adds alternate recipes.
Not anymore; if there is already a rubber or resin, it uses that one.