We picked up a great heaping bunch of 3.5 mm miniature phone jacks that are missing their mounting hardware.
Neither a normal 1/4-42 nut nor an almost normal 6x0.75 fine pitch metric nut seems to fit properly.
Best remaining guess is that it is a 6x0.5 metric nut.
Mouser lists them on page 1479 but declines any order.
Any sources for less than three cents each?