I have encountered a problem:

Belts (made from rubber and are needed for 'small-parts-02', etc.) are not craftable in my game.
The reason seems to be that they are dependent on the technology 'rubber', which does not exist.
I fixed it for me for now by changing the dependency to 'oil-machines ...

deleted because of double posting, sorry.

I have encountered a problem:

Belts (made from rubber and are needed for 'small-parts-02', etc.) are not craftable in my game.
The reason seems to be that they are dependent on the technology 'rubber', which does not exist.
I fixed it for me for now by changing the dependency to 'oil-machines-mk02 ...