This kind of thing happens every once in a while. I either over tightened the zincs or the stud had a fracture and it snapped. "Bummer!" The hard part is getting the out the broken stud. First, I drilled a hole in the stud, heated it up with a torch and tried an easy-out stripped head screw puller. No luck there. Then, I increased the drill bit size until I could tap the hole out. That worked. "Phew!"

Now I'll tell you how I learned to fix this kind of mistake. Gary Howland was the chief mechanic at Brewer Wickford Cove for decades before new management took over. He was a magician. Everyone asked for him by name and I learned a couple of things from him back in the day. Number One: heat. Heat is a great lubricant. I was often amazed to watch him remove a giant prop. He would put a puller on it an apply a load on it. Pop on the torch, then wait for the heat to get the job done. This works for me 95 percent to the time. Stainless into aluminum is a bit more challenging than a stainless nut fused on a stainless stud. Corrosion is a natural occurrence in the marine environment and that was not letting go of what was left of this stud.
Number Two: use a drill press and a very sharp bit. It is almost impossible to drill a straight hole into a stainless stud by hand. If you try it with a dull bit, you will be using expletives soon thereafter. So, I dissassemble the waterjet so I can get it into the press. I bought a Drill Doctor a few years back because we had a drawer full of dull bits. Now, I have a draw full of sharp bits. This one went into the stainless like butter. I was relieved.
Number Three: take it apart first. Watching Gary, I wondered why he would pull half of something apart to make a repair when it didn't seem necessary. But, over time, I realized he was making sure it got done right. He was actually avoiding a do-over, a knuckle-buster, or a new parts order and a reschedule. I didn't want to take the waterjet back off the boat and remove a dozen nuts to fix this thing, but I suspected that if I didn't, it wasn't going to end well for me. Thanks Gary.

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