TM, here's a shot of my carb set up with the turkey pan removed. You can see my dual springs. For a failure to take place, there would have to be a simultaneous failure of both springs -- unlikely. What's more likely is that one breaks and I don't notice it; then a while later, the second one breaks. That's an interesting aspect because it underscores two important points when it comes to our Cobras: 1) You must give your car a "pre-flight inspection" before you drive it; and 2) You have to be particularly aware of your car. A new sound, smell, or feel must be investigated because your car is trying to tell you something (like
"dang, my throttle pedal sure feels easier to push today than it did yesterday, oh well, WTF, I'm just going for a hard drive and not think about it...." )