Nothing really HN style but:
https://www.reddit.com/r/Skookum/ https://www.reddit.com/r/machinists/ https://www.reddit.com/r/AskEngineers/
https://www.reddit.com/r/Skookum/ https://www.reddit.com/r/machinists/ https://www.reddit.com/r/AskEngineers/
I mean the Sub system maybe, thats it. I think theyre pretty similiar