Silly me!!!! I guess that comes from trying to type on an Ipad - I was trying to ask "how did you attach the carbide?" Did you solder or epoxy? I'd guess epoxy would be easy and should hold pretty good... AND - where did you get those nice pieces of carbide? Looks like they are just right. Cost of carbide?
You did a good job with the photo, I can see the counter sunk cap screws and guide pins.
73 de Ken H>