About 2-3 years ago, maybe more, I was boring out something or other, can't remember, and the head of my 1/2" carbide boring bar snapped off. Several months ago I watched a couple of YouTube videos by Stefan and Renzetti, brazing heads to carbide shafts, so I figured I should get the proper flux and silver braze. Well today I fixed it up. After I cleaned it up, I smacked it as hard as I could on a hardwood block a number of times, and it didn't go flying off. I'll have to test it another day.