Precision adjustable Z switch mount.
thingiverse
This mounts to the normal Z switch mount and allows you to adjust it with precision. I use a clamp to jam a nut in the small piece. With a screw to get it lined up just right. Then a nail file to make them fit , but snugly inside each other. The bottom support was added after testing mine at .4 infill without it and observing twist. This prevents twisting which would introduce error. The little holes may need drilling, the big ones should be fine for the spring screw. You want it to be really tight so vibration wont make it turn. Print at 1 infill.
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