The work today concentrated in BSC-4: bellows nozzles were vacuumed out, C-3 support tube covers were installed and secured, and dust barriers were installed. There was a short delay while we looked for a missing Viton rim that attaches to the aLIGO dust barriers. In the end, we punted and used a clean iLIGO dust barrier that was slightly too small with some extra Viton attached.