[Jeff, Daniel]

We cleaned the non-vacuum portion of the 10" to 4.5" CF Zero Length Reducer Flange on Laser Filter Cavity (LFC) Output Vacuum Cube using wipes with isopropanol and acetone to remove sticky tape residue. This worked pretty well. We could not remove the copper gasket for the 4.5" CF Flange by hand or with careful use of a flathead screwdriver. This gasket is likely made of annealed copper and has been in place for ~10 years. We covered the area in UHV foil. Some sources on the internet recommend locking pliers.