The set screws to mount the visors to the articulating corner bracket have gone awol.
These are the two that pinch the visor arm flat section.
Search on the Curylo hardware spreadsheet, the only candidate that looks right is:
53425-S13 8x15x1/2 FH .0262 'screw, flat, PHLPS, Tapping, (location) VISOR ARM AND BRACKET BODY CV
Can someone confirm this? I am a bit surprised to see any 'tapping' descriptor- all others on the spreadsheet use that too.