Tools for working on precision/precise instruments are serious considerations. Lesser tools will damage the instrument being worked on.
Metric (DIN/ISO/JIS) spec slotted screws do not have the same dimensions as Imperial aka US of A "fraction" based screws. They are NOT interchangeable and the tools used to work then must be of the same specifications/dimensions.
Best screwdrivers for slotted head screws have parallel tips. These are known as hollow ground in USA tool industry. The most common variety have a radii ending at the screwdriver tip. This design is inherently weaker due to the unsupported area between the body of the radii to the screwdriver tip.
The best slotted screwdrivers made are PB swiss. Their slotted screwdriver tip design over comes this problem by forging the parallel tip area to fit the slotted screw slot.
This greatly reduces breakage of the screwdriver and transits most of the twisting torque to the screw slot instead of flexing. PB swiss uses as special steel for their screwdrivers. No idea what it is, just the set that has been used for decades has held up remarkably well.
https://www.pbswisstools.com/en/tool...t/pb-610000-70
Smaller slotted head screws are common in watch repair.. They have a different style of slotted screwdriver and they can be really small..
https://www.jewelerssupplies.com/scr...0.6-2.0mm.html
None of these high quality tools are "low cost"..
https://www.jewelerssupplies.com/too...ewdrivers.html
Ideally measure the screw slot width and diameter of the screw head to determine what size metric screw driver is needed for the specific slotted head screw.
Most common slotted drive metric screw is known as a cheese head..
https://fastenerengineering.com/what...e-head-screws/
~Most important to keep in mind, aluminum is very subject to corrosion. What often happens, aluminum internal screw threads can develop corrosion effectively "locking" the screw to the internal aluminum threads. The torque required to remove the screw can snap off the screw head leaving a serious mess of a broken screw in the aluminum part. If the screw is stuck, DO soak the stuck screw in penetrating oil for a day or more before trying to remove the screw. If the screw breaks off, it will ruin a lot more than just that day.~
Bernice
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