I was told sometime in the past that guns here in Britland where fitted with screws having such a narrow screwdriver slot to stop the public using ordinary screwdrivers available just about every where to take guns apart and generally fiddling with them. And because of we have always done it that way the practice has continued well that was the reason I was given true or false who knows.
I was at a small factory that was closing down some thirty years ago, it was a long established specialist manufacture of fixings in Sheffield included in its customers where some in the Birmingham gun trade.
While I was here I collected up a handful of specialist slitting saws used in the manufacture of gun screws. In the photographs are some of the saws such small things that give us such a big screwdriver headache, the battery is for scale.





The only lessons in my life I truly did learn from where the ones I paid for!