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There used to be an old trick of putting a paperclip or something like that on the diaphragm rod to assure that the secondaries are opening completely..........

Just sayin'...........might as well make sure you're gittin' all she's got now.

Yes I agree, I did that exact thing to find out the secondaries were hardly opening at all on my '28 hot rod. I had the lightest springs available, so there was nothing I could do about it. The car was just too light for the horsepower (built 468 BB Chevy) to generate enough load.