After dicking around with it, I got it to where I was happy with the fit. I distinctly remember the days when I was shooting for no gaps in the fit, but as you get more practice in the goal turns into wanting absolutely no black lines or shadows in the fit up. I'm not sure how well it shows in the pic, but this one is tight as a drum and I'm pretty happy with it;
Now this is a million dollar trick that Tim Hancock and Mike Vagnino taught me, and I'm pretty sure (don't hold me to it) that Buster Warenski told Tim about it. I'm not trying to spread rumor or misinformation, just give credit where it's due

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Okay, so that last pic didn't make sense right? Well I hope this one will. When you're dealing with precision ground surfaces that are parallel, and centerlines for lay-out and reference... you don't want your guard to be off of square. If you hold a mirror flat (and firmly) on top of the guard, then eye down the spine of the blade--- If the guard is square to the blade, then the reflection of the spine will be perfectly in line with itself. If the guard is canted, the reflection will kick off to the high side. Yay... this one is square

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Time to fit up some spacer material- thin copper and black G10 from my friends at Alpha Knife Supply.

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This need to fit well, but there's no super precision required here, so I just lay-out the lines with a ruler and the tang width/thickness as a guide;
Got our lines all drawn in;
So I have fought, and fought, and fought with how to cut and slot spacer material. Most of it will tear the teeth off of a bandsaw, and getting the slot in the center can be a ROYAL pain. I've tried things like various dremel bits, drill bits, fixturing the pieces and machining the slot, etc. Then I bought this el-cheap-O jeweler's saw off of ebay for like $20 with the blades. It is like a miracle for cutting spacers!!!
Drill a quick pilot hole in the corner of where you want the slot to be;
Sawing out the hole. Of course you have to take one end of the saw blade out of its clamp and feed it through the hole, then clamp it back down before you can saw anything. It cuts this stuff like it's butter;
Here are the slots sawn out... it took me far longer to take these pictures than it did to saw these out. A few light passes with a file and they'll be golden;