Terrific post. I am just getting to the steering wheel of the AC Six and had planned to do a blog on my approach since I am changing up the design a bit. You posted a lot of good information for us. thank you.
I get the idea that Google has not translated the word "knoop" (clothing knob/button) correctly. I do not know the English name myself and therefore the question to you what the correct English word is for the following:
To me it looks like a wooden button. I didn’t know you were from Holland. Where did you get that wooden button/knob? In America the word knob has something to do with doors or girls. Example: replace the door knob or she has nice knobs. Or look at the knobs on her. It’s a slang term when you refer to chicks.
I bought it in a store were they sell clothing buttons to fix or to make something. But it is also avaible at for example AliExpress. Search for wood button. AliExpress buttons