Reverted the probing routines so that they probe quickly, back off quarter of the probe's diameter and then probe slowly to get an accurate measurement.
Reverted the probing routines so that they probe quickly, back off quarter of the probe's diameter and then probe slowly to get an accurate measurement.

I had changed it to probe in quickly and then probe backwards slowly until the probe switch changed back.  This proved slightly less reliable.  If the probe tripped and then reset then the probe backwards movement would fail.

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