Yes - The actual measurement procedure is "above my pay grade"
Afterthought: Look at the broken off surfaces on the flexplate. If some of the surfaces are discolored, dirty or rusty - the failure happened over a period of time. It everything is bright and shiny, it was a quick failure.
Looking at the flexplate picture in Post # 13, I "think" I see old cracks that have lots of age showing on them.