[Torrey, Ian, Lee, Daniel]

We cleaned the end cubes (which are in B102) with a clean room wipe and isopropanol since I there was some residual grime from my cleaning in B150 (or it was introduced after I cleaned, maybe during the move). We then took the top of the end cubes off and looked at the inside to look for the internal hole pattern on the bottom flange. In the SolidWorks model, they had 4 #10-32 tapped holes. Unfortunately, one cube has no holes and the other cubes has just one hole (see attached photos). One of the bend cubes (in B150) has a flange taken off and covered in foil, so I went to check the inside of that cube. I couldn't see the bottom since a mirror base was still in the cube.

In order to hold the mounts for the Laser Filter Cavity mirrors, we have 3 options. The first is to buy a new bottom flange with tapped holes. I couldn't find this product, but I did ask ~6 companies if it exists.

The second option is to machine holes ourselves. I think I could do this myself or we could pay someone to do it.

The third option is a more creative solution from Lee to hold a 6" diameter circular breadboard with friction. I don't love this idea because it's inevitably going to come lose.