Two light springs, one slightly stronger than the other and pulling from the opposite direction and on the opposite side of the throttle shaft, can help offset a throttle cable and a single spring's constant pull and wear on the throttle shaft bushings.
When properly sized and located, they help counter each others tendency to pull the throttle shaft into the bushing.
Some carbs have a return spring built into the throtle shaft.
1970 Plymouth 'Cuda #'s 440-6(block in storage)currently 493" 6 pack, Shaker, 5 speed Passon, 4.10's
1968 Plymouth Barracuda Convertible 408 Magnum EFI with 4 speed automatic overdrive, 3800 stall lock-up converter and 4.30's (closest thing to an automatic 5 speed going)
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