Great write up. I too have spent quite a lot of time with machines of all types and spent years with them all tinkering and tuning, sometimes even modifying them too. Getting them to run the way I need them. It for quite the obsession and learning experience too.
I sold most of them years ago and am now down to about 6 rotary machines and 8 coils as well, but the coils are all built up from bare frames with parts sourced from all over and often modified by myself.
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