The projector screen up/down switch needs to be moved to another location. As I took it down to see what could be done, a small vital part fell down a crack in the stage floor and is now wedged under the laminate.
The cover of the control had been cut to allow cable entry and is not really suitable for use in a more visible location. I have ordered a replacement control (under £8), a better way than cutting a hole in the floor to retrieve the part. I intend to mount it in its new location, under the projector control buttons.