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>