One other thought- this item may have to do with preparing the cartridge in use-
Does one end of a sealed paper cartridge need to be punctured and the charge poured in the barrel?
Is the hole to locate the tool over the ball, sitting on the end of the barrel, so more pressure can be applied to start it in the bore?
A maintenance tool does not need to be carried close to hand at all times..
A fighting tool does.
Just tossing some ideas out.
This thing has a definite purpose, and it is likely the screwdriver is a ancillary function, not a primary one.
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