Backstage snippet (Patreon)

Changing gobos (the image disks) in the very heavy Domino fixtures.  These lights are sealed with panels that resemble camshaft covers, and have to have the large number of screws replaced with sequential tightening with a torque screwdriver before being pressure tested with a dedicated unit that pressurises the unit, holds, pulls a vacuum, holds and then restores atmospheric pressure.  All to test that the seals are good.

https://www.youtube.com/watch?v=71mxo4CTJrg