It is generally not known, but many of the better double guns, including the Parker I believe, were made up with tapered holes for the various action cross pins. Thus, if a pin is drifted out in the wrong direction, it is jammed through the small end of the tapered hole and becomes undersize in the process. The taper of the hole suffers, too.
Result: When the gun is reassembled, pins are loose, and often drift laterally in use.
So... knowing the proper direction in which to drift out a double gun pin is part of being a responsible double gunsmith.
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