Fixing Broken Head Bolts

I found this interesting tidbit from subscriber James Degnitz of Fredonia, Wisconsin, in "Successful Farmer" magazine and thought I'd pass it along since we've had some experiences like this ourselves:

"To replace the exhaust manifold gaskets on an engine when the head bolts broke off, I heated the stud red-hot with a torch and took a candlestick to the stud. As the candle melted, wax was drawn into the thread, lubricating it and pushing the rust out. The bolt turned easily."