Specialized Typewriter Tools
From Typewriter Wiki
Introduction
Like with many other types of repairmen, typewriter repairmen were often provided by manufacturers with specialized tools to complete specific tasks or make certain tasks easier. Here, we will attempt to showcase the many different kinds of tools and their general uses.
IBM "Semi-Proprietary" Tools
IBM had the tendency to use what I like to call "semi-proprietary" tools. This means that they are not tools or driver heads that IBM came up with, but rather unique and uncommon ones that they used. It was most likely a way to keep their machines only repairable by technicians, and to get said technicians buying only their tools. However, this is only a educated guess, so take it with a grain of salt.