For the hardware I made it my mission to use as much common off the shelf components as I could that had a long supply life.

I recall an Open Source touch rotary switch that had a small LCD screen in the centre of it. I thought it looked like something that Tony Stark would have built. However there was one part (a major part at that) that was bought of Alibaba or something, I think it was the motor. This part was “off the back of a truck” so you couldn’t buy a replacement and other people couldn’t make one as well.

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