Please explain this. I've heard it mentioned many times over the years, but a quantitive explanation would be most useful. What does it sound like, considering everyone's farts quite different.
Yeah these are standard quarter inch jack sockets. Any suitably sized retaining nut will fit, they have a standard diameter and thread for those jacks.
There are narrow combos which have a standard 19inch rack width head, and wider combos (typically the 4x10 versions) which have a wider head, around 23 inches.