Don't the very narrow English gun screw (pin) slots have a taper to them, in other words, wider at the top and very narrow at the bottom? I once read this, and read that it was because if you have a "V" shaped slot and a correspondingly ground screwdriver blade, when sufficient down pressure is applied as the screw is torqued there can be no movement of the blade in the slot. It would always be a perfect fit, so long as the width was right.
One of you Englishmen please tell me if this is so, or if the slots have parallel sides.
SRH
Last edited by Stan; 08/30/13 05:02 PM.
