The best feature of those little thumb screws was that the computer-side mount could become unscrewed and fall off when you were trying to remove the cable. On

The best feature of those little thumb screws was that the computer-side mount could become unscrewed and fall off when you were trying to remove the cable. On some machines, it was held in with a tiny little nut on the inside of the case. The nut was just the right size to fall onto a motherboard and bridge PCB traces or exposed I/O pins. Of course, there was no way to detect this by feel.