I'm looking for a source for a replacement spring for the vacuum secondary spring, whether it be a vendor that sells them, or a something to rob them from (toys, common carburetors, etc.)

I want to do some experiments to find a more optimal opening timing and rate using different spring rates, but I don't want to mess with my original spring; particularly cutting it, since that not only irreversibly damages it, it also increases the spring rate.

Has anyone found a source for replacement springs for the vacuum diaphragm?

 

have u tried replacement springs for a holley carb?

 

Unfortunately, all the information I've been able to find on the Holley vacuum secondary springs seems to indicate the spring rate is way too low. The highest spring rate from the graphs I've found is about 1.2 ounces/inch (0.075lb/in). From the dimensions of the spring in our vacuum secondary diaphragms, the spring rate should be around 0.5lb/in (8 ounces/inch).