Ummmm....
All I do is what I saw Ed Fowler do in his movie.
The guard fits all around the tang of the knife. The brass at the top end of the tang hole is still about 1/4 inch thick.
From the lower end of the tang hole to the lower end of the brass is,,,about 1 &1/2 inches.
Now, the brass is 3/4 inch square. I mark the position of the tang onto the brass, I drill it, I file,,I fit it, I bang the last bit of the tang into position, ,,,and then I notice that almost every time the "up and down" of the brass, is not the "up and down" of the tang/knife.
Now I did try once to just use my grinder to trim the top area of one side, and the lower part of the other side, but it gave me mixed results.
The guard ended up with an odd shape
Here is a question:
as I start grinding a blade, I 1st grind the outside lines, the profile.
next I use the platten and grind the blade flat.
But......But I hold the knife by the tang as I flat grind so Im not actually flat grinding, I really putting a taper on the blade as the point area gets a bit thinner being more on the platten than the tang areas due to the tang is where my fingers are while I hold onto the knife.
The problem is that when fileing and fitting the guard onto the tang,,,,and slideing the guard up the tang and into position, The tang is tapered in what seems both dirrections.
the tang starts out near the butt end thin, it gets thicker as you move up the tang, but then I hit the area that was sanded on the platten while flat grinding and that area starts to taper in the other direction to the point of the knife.
So this means that my guard slot has to be big enough to fit the tang, but then the tang gets thinner right where the guard will seat and so there is a gap.
How do you flat grind the blade and the racasso and yet not grind the tang taper in the wrong direction?