The blades are tapered both forward from the tang/blade junction, and then to the rear. The slot in the one piece grip is sawn with a thin blade then sawn or filed to a V shape as best as one can do, making a snug fit in the V. The grip should be a squared blank in order to center everything. To drill the pin holes in the grip, I super glue, with a couple of small drops, the tang to the grip blank on one side, in the position I want it, then using the tang holes as guides, drill through the blank. To break it loose afterwards, I just smack it on my work bench. Then the blank can be pre-shaped and roughly finished before it is locked in by peening the pins. In shaping the blank, the sides and bottom flats taper towards the blade. Then the grip can be made oval, octagon or also, if English, diamond with narrow flats top and bottom. To be correct, the grip should overlap the tang on the bottom from 1/16" to 1/8", more or less. The grips were originally over sized, and it is theorized that they were a one size fits all, for the three basic sizes offered, so possibly on a scalper style with a larger than 7" blade, the grip may not have overlapped but little, if at all. The English drilled their tang holes low of center in order for the pins to be relatively centered in the over sized grip. The French were not so particular.