While I''m on the subject of "thrown-together" prototype misc projects.....
Here's a touch probe experiment.
It uses a ball pointed sewing needle to lower down and just trip
a common micro-switch that was in the junk box.
I forget if it was an N.O. or N.C. wiring job, but it works well in Mach3.
It doesn't work sideways though, so it's very limited to it's usefulness.
But anyways, it's just an experiment mainly to see if it'd work. I'd
buy one now that I've seen for myself that it does. And it could be
useful enough that I'd buy a good one if I did.
John