This incident makes a strong case for the use of paint as well as nails to mark points.
If the Protege had been used instead of the Jones in the first place, there would have been no need to consider the possiblity of a skipping counter. I know some measurers fret about the possiblity of electronic counters skipping impulses, but I have never seen this happen with the Protege nor have I been able to induce this.