My binocs have eye cups held in place with tiny screws. Two of these
screws came out and I could not find a place to get them until I
looked through the Small Parts catalogue. I ordered some 90 TPI
(thread per inch), some 120 tpi and some 160 tpi. Turns out the 90
tpi are correct but you'd have to see the 160 tpi to believe em, Dang
they are tiny. They make eyeglass screws look huge.