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The springs have a "constant" known as "k".Every time before I turn my Pole Position on, I pull up on the pedal to make sure it's "home". If I don't do this, I only get enough sweep out of the pot where it tops out at 225. I replaced my pot and cable a few years ago, but my guess is the spring is a little tired and it won't take it "home" that last small increment to get full pedal travel. Pulling up on the pedal for me prior to turning on has worked every time.
Springs break down over time due to fatigue (and our feet slamming them to the floor)
Seek out new springs. They may be a little "taller" than the old ones, but that doesn't matter.
The critical parameters for most springs are:
1. Wire diameter
2. Height
Get out your micrometer and see what you have, or find someone who makes good repros.
Springs will typically wear out depending on the function faster than a potentiometer.

