Hi, I broke a carb the same way. If it broke when you were tightening the clap the elbow is too small. Plumbing copper pipe is the wrong size. Refrigeration tubing also made of copper is a perfect fit and you can solder it. The actual od of the tubing that fits tight in the carb is 3/4" I'm not sure but I think they called it 5/8 refrigeration tubing. Lowe's doesn't have the refrigeration tubing only plumbing. Go to a place that installs or repairs residential ac or heating units and just tell them you need a piece of tubing 3/4" actual size. They gave me a scrap piece. I have a picture of mine on this site under Pictures. It is called "Tight fit" by i-paint.