This video shows the turn throw down to maybe 1/4". This is in the "Adam's resonance" range: the limit switch can glue to the floor of the glass case and a small hole can be drilled through it for a tiny rod to the ferrite piston.
https://www.youtube.com/watch?v=GeeivXPsuro
https://www.youtube.com/watch?v=GeeivXPsuro
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