My friend John helped me extensively with my garage addition. The nipple of his one month old muffler from his lawn mower pulled out of the muffler can.
1. Nipple broke off muffler

It appeared to be a design problem. When they tapped the rolled over collar of the can the tap nearly cut entirely through the sheet metal of the collar of the can. With the vibration of the mower the can broke off completely.
2. Thin Shell of can broke off

I decided to replace the nipple so that I could weld to a solid nipple instead of the old threaded nipple with a thin collar of sheet metal on it. The first step was to cut off the threads of the replacement nipple, using the parting tool on the lathe.
3. Cutting off nipple threads

4. Nipple threads cut off

5. Original and replacement nipple
1. Nipple broke off muffler
It appeared to be a design problem. When they tapped the rolled over collar of the can the tap nearly cut entirely through the sheet metal of the collar of the can. With the vibration of the mower the can broke off completely.
2. Thin Shell of can broke off
I decided to replace the nipple so that I could weld to a solid nipple instead of the old threaded nipple with a thin collar of sheet metal on it. The first step was to cut off the threads of the replacement nipple, using the parting tool on the lathe.
3. Cutting off nipple threads
4. Nipple threads cut off
5. Original and replacement nipple
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