Unless all the foreign metal from the old stud has been removed, you run the risk of breaking another tap. The thread chaser or tap should only be used to clean up the damaged cast iron threads from the chisels, punches, and picks used to remove the fragments of the old stud.
Please don't try to cut out old stud threads. You have done that once already and it didn't work. I call that method "cheating". You will probably get another failing grade. How many "Acks" are you willing to endure? Use heat, picks, and small chisels to remove the old stud fragments. Don't worry about buggering up a few threads. You have plenty to secure a lousy water jacket cover. And there is always epoxy thread repair material.
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Today's Featured Article - The Cletrac General GG and the BF Avery A - A Bit of History - by Mike Ballash. This article is a summary of what I have gathered up from various sources on the Gletrac General GG and the B. F. Avery model A tractors. I am quite sure that most of it is accurate. The General GG was made by the Cleveland Tractor Company (Cletrac) of Cleveland, Ohio. Originally the company was called the Cleveland Motor Plow Company which began in 1912, then the Cleveland Tractor Company (1917) and finally Cletrac.
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