Was going to buy a bigger coil (more stroke, larger 4mm hole) but realized the coil is twice the size (almost as big as a real pinball coil) so I cancelled my order. I'm going to try to make these smaller coils work so I bought some M2 screws and nuts. I think I just need to mechanically get it to work (smooth rotation, the right torque arm, etc).
Also the flats I ground on the dowel pins were a bit sloppy. Started out pretty good, the metal started to warm up and make the 3d printed fixture soft, which made the pin turn. I think I need to try again, and either pause after grinding a single spot, or keep a spray bottle handy to cool it down.
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