[Erin, Daniel]
We put the uncoated silicon mirror in between the two half rings. I had hoped that the mirror would not be clamped until the rings were within ~10 thou of each other, but the gap looks more like 30 thou. I will take a measurment and a photo later today.
The rings are too close to use the callipers to measure. I also noticed a bit of a gap between the ring and the optic.