Just a word about slot screw heads and modern screw driver type tools.
The tips on modern screwdrivers are tapered and the old type screwdrivers used by armourers have parralel tips.
The difference is that the tapered screwdrivers will naturally try and climb out of the slot head, that is why they round off and are so hated. An armourer type friend taught me this.
My 2 penny worth
R
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