I have always used drywall screws on tenons, I know, bad Idea. I don't turn many bowls, but about a year and a half ago, I started turning a shallow purple heart bowl. I mounted it to the lathe with a faceplate to turn the outside. For the first time I used wood screws. They were probably a bit longer than I needed. While I was putting the screws in, one broke off. Yeah, that Purple Heart is like concrete. I removed the faceplate, rotated it slightly, and screwed it back on. The problem I have now is I need to hollow the bowl, and I don't want to hit the broken screw. I decided to cut a mortise inside the screw line, and hollow the bowl outside that line. That left a spigot in the center of the bowl.
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I used a bowl gouge to hollow the bowl, and it worked fine. I got deep enough where I probably will not contact the screw when I tunnel under. I can hollow 1/2 inch deeper into the bowl if necessary. My effort to tunnel under caused a massive catch when the far side of the BG contacted the spigot. It broke the tenon off the bowl. I have reworked the tenon where I think it will hold if I am careful. So now my question is, how would you remove this spigot with out getting a catch? Is there a different tool that would work better than a BG? Do I just hit it with a hammer? Do I use a chisel and mallet to try to break the tenon off? If so, would you drive the chisel into the side grain or the end grain of the spigot? The screw is so tight it broke my easy out. I thought I might use a Dremmel and try to cut around that screw but that is a huge amount of work if there is a better way.
So, what do you think? How would you get this out?