Broke my water pump bolt. Now what? (Update - broken bolt is out)

Red Loctite again. : ) Make sure its "use by date" is not expired. I slightly do remember I did do this successfully once on an exhaust manifold broken stud. If the threads are not mangled from vice grips and you can grab a few threads with the nut on it, it very well may work and is worth a try IMO. No welding or drilling or transport or other hassle required.