CRT Adjustment tools are often made from Nylon or Plastic. Being a natural insulator, it decreases your changes of shorting out something within the monitor chassis. Being made from the same material as the adjustment pots, it prevents you from damaging the on-board adjustment pots with sharp metal tools. Finally, some adjustment coils (like the horizontal width adjustment coil on common G07 & K4900’s) are often ferrite core - metal tools can demolish them.
Before I set out to create one, I did a quick search and found this set:
https://www.thingiverse.com/thing:1802360/files
2.5mm is close enough to the .100” adjustment tool for a horizontal width coil adjuster.
I scaled it on the y-axis to give myself a little room to maneuver around the yoke assembly.
Slot head for nylon adjustment pots
For the nylon adjustment pots, a small flat-head tool is handy.
I found this one and scaled it down to about 25% of the original design size.
https://www.thingiverse.com/thing:3916160/files