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It seems ordinary snap-action / tactile-feedback switches are repeatable enough for most purposes
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I hacked this charging current display into the cradle so I could see when the [mumble] thing was actually charging
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I doubt the tape will prove to be a permanent fix
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The catch is that the Sherline motor driver box doesn’t include connections for any of the parallel port input pins
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As nearly as I can tell, the tube simply failed at that point, without any external aggravation.
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The snows have retreated and it seems the mice have been busy tunneling in the back yard…
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The switch is, of course, not intended to be repairable, but that’s something of a motivator around here.
