Common Methods of Measuring the Diameter of a Hole

[Mayhem]

Thanks for that Tom. I had seen the telescoping gauge done similar but the instruction was to tighten the screw when on axis and then rock back off axis to get it out. I therefore thought that you screwed down tight, which I now see isn't correct. Perhaps I misunderstood those directions, but I found yours easy to follow.

I just have to remember not to tighten the mic up too much, as that tends to reduce the size real quick

I think you should dust off your old lesson plans from the 70s and turn them into instructional videos...