I cleaned some 1/4-20 button head screws, 1/2" long with acetone and isopropanol since they were greasy. I used these and some spring tab t-nuts that don't slide down under gravity to reassemble the 80/20 structure to support the bottom and sides of the 8" CF to 6" CF reducing tee on the Laser Filter Cavity (LFC) Vacuum System. To be honest, I'm not sure how much it's actually helping support the weight. I'm also using a scissor stand platform to help with the weight. I did not assembled the 45° brackets since it will be easier to install them with more spring tab t-nuts. 

Note for others when assembling 80/20: a small hex key is great at positioning the t-nuts, especially the cheap ones that can slide around.

Note for me and others going forward: thicker viton (~1/4" thick) would make the contact between the 80/20 and the tee much better.